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description Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 Germany, Belgium, Netherlands, GermanyPublisher:Wiley Funded by:FCT | D4, EC | LOFAR-AUGER, EC | LOFARFCT| D4 ,EC| LOFAR-AUGER ,EC| LOFARBrian Hare; Harald E. Edens; Paul R. Krehbiel; W. Rison; Olaf Scholten; Stijn Buitink; Arthur Corstanje; Heino Falcke; Jörg R. Hörandel; Tim Huege; G. K. Krampah; Pragati Mitra; Katie Mulrey; Anna Nelles; H. Pandya; Jörg P. Rachen; Satyendra Thoudam; T. N. G. Trinh; S. ter Veen; Tobias Winchen;doi: 10.1002/essoar.10504601.1 , 10.1029/2020ea001523 , 10.5445/ir/1000136948 , 10.3204/pubdb-2022-00220 , 10.1002/essoar.10504601.2
handle: https://repository.ubn.ru.nl/handle/2066/235881 , 20.500.14017/c713d067-b6c0-4a56-b975-2e23eaa2c127 , 2066/235881 , 11370/1d3a1b22-a37e-4a7e-9d28-9cf06c29f7aa
pmc: PMC8365654
pmid: 34435079
doi: 10.1002/essoar.10504601.1 , 10.1029/2020ea001523 , 10.5445/ir/1000136948 , 10.3204/pubdb-2022-00220 , 10.1002/essoar.10504601.2
handle: https://repository.ubn.ru.nl/handle/2066/235881 , 20.500.14017/c713d067-b6c0-4a56-b975-2e23eaa2c127 , 2066/235881 , 11370/1d3a1b22-a37e-4a7e-9d28-9cf06c29f7aa
pmc: PMC8365654
pmid: 34435079
Since their introduction 22 years ago, lightning mapping arrays (LMA) have played a central role in the investigation of lightning physics. Even in recent years with the proliferation of digital interferometers and the introduction of the LOw Frequency ARray (LOFAR) radio telescope, LMAs still play an important role in lightning science. LMA networks use a simple windowing technique that records the highest pulse in either 80 ��s or 10 ��s fixed windows in order to apply a time-of-arrival location technique. In this work, we develop an LMA-emulator that uses lightning data recorded by LOFAR to simulate an LMA, and we use it to test three new styles of pulse windowing. We show that they produce very similar results as the more traditional LMA windowing, implying that LMA lightning mapping results are relatively independent of windowing technique. In addition, each LMA station has its GPS-conditioned clock. While the timing accuracy of GPS receivers has improved significantly over the years, they still significantly limit the timing measurements of the LMA. Recently, new time-of-arrival techniques have been introduced that can be used to self-calibrate systematic offsets between different receiving stations. Applying this calibration technique to a set of data with 32 ns uncertainty, observed by the Colorado LMA, improves the timing uncertainty to 19 ns. This technique is not limited to LMAs and could be used to help calibrate future multi-station lightning interferometers. Earth and Space Science 8(7), 2020EA001523 (2021). doi:10.1029/2020EA001523 Published by American Geophysical Union, Malden, Mass.
NARCIS arrow_drop_down Europe PubMed CentralArticle . 2021Full-Text: http://europepmc.org/articles/PMC8365654Data sources: PubMed CentralVrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10504601.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert NARCIS arrow_drop_down Europe PubMed CentralArticle . 2021Full-Text: http://europepmc.org/articles/PMC8365654Data sources: PubMed CentralVrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10504601.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 Germany, Czech Republic, Netherlands, BelgiumPublisher:Wiley Funded by:EC | LOFAR-AUGER, EC | LOFAREC| LOFAR-AUGER ,EC| LOFAROlaf Scholten; Brian Hare; Joseph R. Dwyer; C. Sterpka; Ivana Kolmasova; Ondrej Santolik; Radek Lan; Luděk Uhlíř; Stijn Buitink; Arthur Corstanje; Heino Falcke; Tim Huege; Jörg R. Hörandel; G. K. Krampah; Pragati Mitra; Katharine Mulrey; A. Nelles; H. Pandya; A. Pel; Jörg P. Rachen; T. N. G. Trinh; S. ter Veen; Satyendra Thoudam; Tobias Winchen;With LOFAR we have been able to image the development of lightning flashes with meter-scale accuracy and unprecedented detail. We discuss the primary steps behind our most recent lightning imaging method. To demonstrate the capabilities of our technique we show and interpret images of the first few milliseconds of two intracloud flashes. In all our flashes, the negative leaders propagate in the charge layer below the main negative charge. Among several interesting features we show that in about 2 ms after initiation the primary initial leader triggers the formation of a multitude (>10) negative leaders in a rather confined area of the atmosphere. From these only one or two continue to propagate after about 30 ms to extend over kilometers horizontally while another may propagate back to the initiation point. We also show that normal negative leaders can transition into an initial leader like state, potentially in the presence of strong electric fields. In addition, we show some initial breakdown pulses that occurred during the primary initial leader, and even during two ���secondary��� initial leaders that developed out of stepped leaders. Journal of geophysical research / D 126(4), 033126 (2021). doi:10.1029/2020JD033126 Published by Wiley, Hoboken, NJ
Journal of Geophysic... arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research PortalRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . PreprintLicense: CC BY NC NDData sources: UnpayWallRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . 2021 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefhttps://doi.org/10.48550/arxiv...Article . 2020License: arXiv Non-Exclusive DistributionData sources: DataciteJournal of Geophysical Research AtmospheresArticle . 2021Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10503153.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Journal of Geophysic... arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research PortalRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . PreprintLicense: CC BY NC NDData sources: UnpayWallRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . 2021 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefhttps://doi.org/10.48550/arxiv...Article . 2020License: arXiv Non-Exclusive DistributionData sources: DataciteJournal of Geophysical Research AtmospheresArticle . 2021Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10503153.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Belgium, Germany, Netherlands, GermanyPublisher:American Geophysical Union (AGU) Funded by:EC | LOFAR-AUGER, NWO | Turning the Moon into a n..., EC | LOFAREC| LOFAR-AUGER ,NWO| Turning the Moon into a neutrino detector with LOFAR ,EC| LOFART. N. G. Trinh; Olaf Scholten; Stijn Buitink; Ute Ebert; Brian Hare; Paul R. Krehbiel; Hidde Leijnse; Antonio Bonardi; Arthur Corstanje; Heino Falcke; T. Huege; Jörg R. Hörandel; G. K. Krampah; Pragati Mitra; Katie Mulrey; A. Nelles; H. Pandya; Jörg P. Rachen; Laura Rossetto; Casper Rutjes; S. ter Veen; Tobias Winchen;An analysis is presented of electric fields in thunderclouds using a recently proposed method based on measuring radio emission from extensive air shower events during thunderstorm conditions. This method can be regarded as a tomography of thunderclouds using cosmic rays as probes. The data cover the period from December 2011 till August 2014. We have developed an improved fitting procedure to be able to analyze the data. Our measurements show evidence for the main negative‐charge layer near the −10° isotherm. This we have seen for a winter as well as for a summer cloud where multiple events pass through the same cloud and also the vertical component of the electric field could be reconstructed. On the day of measurement of some cosmic‐ray events showing evidence for strong fields, no lightning activity was detected within 100 km distance. For the winter events, the top heights were between 5 and 6 km, while in the summer, typical top heights of 9 km were seen. Large horizontal components in excess of 70 kV/m of the electric fields are observed in the middle and top layers. Journal of geophysical research / D 125(8), 20 (2020). doi:10.1029/2019JD031433 Published by Wiley, Hoboken, NJ
Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2020Full-Text: http://europepmc.org/articles/PMC7375151Data sources: PubMed CentralJournal of Geophysical Research Atmospheres; Vrije Universiteit Brussel Research PortalOther literature type . Article . 2020 . Peer-reviewedLicense: CC BYJournal of Geophysical Research AtmospheresArticle . 2020Data sources: Eindhoven University of Technology Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: University of Groningen Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2019jd031433&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 28 citations 28 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2020Full-Text: http://europepmc.org/articles/PMC7375151Data sources: PubMed CentralJournal of Geophysical Research Atmospheres; Vrije Universiteit Brussel Research PortalOther literature type . Article . 2020 . Peer-reviewedLicense: CC BYJournal of Geophysical Research AtmospheresArticle . 2020Data sources: Eindhoven University of Technology Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: University of Groningen Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2019jd031433&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2019 France, France, Germany, France, Spain, FrancePublisher:EDP Sciences Funded by:EC | ASTERICSEC| ASTERICSNigro, C.; Deil, C.; Zanin, R.; Hassan, T.; King, J.; Ruiz, J. E.; Saha, L.; Terrier, R.; Brügge, K.; Nöthe, M.; Bird, R.; Lin, T. T. Y.; Aleksić, J.; Boisson, C.; Contreras, J. L.; Donath, A.; Jouvin, L.; Kelley-Hoskins, Nathan; Khelifi, B.; Kosack, K.; Rico, J.; Sinha, A.;The analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. The effort of defining a common data format for high-level data, namely event lists and instrument response functions (IRFs), has recently started for very-high-energy gamma-ray instruments, driven by the upcoming Cherenkov Telescope Array (CTA). In this work we implemented this prototypical data format for a small set of MAGIC, VERITAS, FACT, and H.E.S.S. Crab nebula observations, and we analyzed them with the open-source gammapy software package. By combining data from Fermi-LAT, and from four of the currently operating imaging atmospheric Cherenkov telescopes, we produced a joint maximum likelihood fit of the Crab nebula spectrum. Aspects of the statistical errors and the evaluation of systematic uncertainty are also commented upon, along with the release format of spectral measurements. The results presented in this work are obtained using open-access on-line assets that allow for a long-term reproducibility of the results.© ESO 2019. This work was supported by the Young Investigators Program of the Helmholtz Association, by the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Center SFB 876 >Providing Information by Resource-Constrained Analysis>, project C3 and by the European Commision through the ASTERICS Horizon2020 project (id 653477). Peer Reviewed
E-Prints Complutense arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2019 . Peer-reviewedData sources: Recolector de Ciencia Abierta, RECOLECTARecolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2019 . Peer-reviewedRecolector de Ciencia Abierta, RECOLECTA; Docta ComplutenseOther literature type . Article . 2023 . 2019Astronomy and AstrophysicsArticle . 2019 . Peer-reviewedLicense: EDP Sciences Copyright and Publication Licensing PolicyData sources: CrossrefHAL-Inserm; Hal-DiderotArticle . 2019https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201834938&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 41 citations 41 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!visibility 23visibility views 23 download downloads 27 Powered bymore_vert E-Prints Complutense arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2019 . Peer-reviewedData sources: Recolector de Ciencia Abierta, RECOLECTARecolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2019 . Peer-reviewedRecolector de Ciencia Abierta, RECOLECTA; Docta ComplutenseOther literature type . Article . 2023 . 2019Astronomy and AstrophysicsArticle . 2019 . Peer-reviewedLicense: EDP Sciences Copyright and Publication Licensing PolicyData sources: CrossrefHAL-Inserm; Hal-DiderotArticle . 2019https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201834938&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2019 France, France, GermanyPublisher:Springer Science and Business Media LLC Funded by:EC | LASERLAB-EUROPE, EC | VOXELEC| LASERLAB-EUROPE ,EC| VOXELJoana Duarte; R. Cassin; Julius Huijts; Bianca Iwan; F. Fortuna; L. Delbecq; Henry N. Chapman; Marta Fajardo; Milutin Kovacev; Willem Boutu; Hamed Merdji;Recovering the three-dimensional (3D) properties of artificial or biological systems using low X-ray doses is challenging as most techniques are based on computing hundreds of two-dimensional (2D) projections. The requirement for a low X-ray dose also prevents single-shot 3D imaging using ultrafast X-ray sources. Here we show that computed stereo vision concepts can be applied to X-rays. Stereo vision is important in the field of machine vision and robotics. We reconstruct two X-ray stereo views from coherent diffraction patterns and compute a nanoscale 3D representation of the sample from disparity maps. Similarly to brain perception, computed stereo vision algorithms use constraints. We demonstrate that phase-contrast images relax the disparity constraints, allowing occulted features to be revealed. We also show that by using nanoparticles as labels we can extend the applicability of the technique to complex samples. Computed stereo X-ray imaging will find application at X-ray free-electron lasers, synchrotrons and laser-based sources, and in industrial and medical 3D diagnosis methods. Nature photonics 13(7), 449 - 453 (2019). doi:10.1038/s41566-019-0419-1 Published by Nature Publ. Group, London [u.a.]
Nature Photonics arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41566-019-0419-1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 10 citations 10 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Nature Photonics arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41566-019-0419-1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2017 Germany, France, BrazilPublisher:Elsevier BV Funded by:EC | ASTERICSEC| ASTERICSHassan , T.; Arrabito , L.; Bernlöhr , K.; Bregeon , J.; Cortina , J.; Cumani , P.; Di Pierro , F.; Falceta-Goncalves , D.; Lang , R.G.; Hinton , J.; Jogler , T.; Maier , G.; Moralejo , A.; Morselli , A.; Todero Peixoto , C.; Wood , M.;The Cherenkov Telescope Array (CTA) represents the next generation of ground-based instruments for very-high-energy (VHE) gamma-ray astronomy, aimed at improving on the sensitivity of current-generation experiments by an order of magnitude and providing coverage over four decades of energy. The current CTA design consists of two arrays of tens of imaging atmospheric Cherenkov Telescopes, comprising Small, Medium and Large-Sized Telescopes, with one array located in each of the Northern and Southern Hemispheres. To study the effect of the site choice on the overall CTA performance and support the site evaluation process, detailed Monte Carlo simulations have been performed. These results show the impact of different site-related attributes such as altitude, night-sky background and local geomagnetic field on CTA performance for the observation of VHE gamma rays. Astroparticle physics 93, 76 - 85 (2017). doi:10.1016/j.astropartphys.2017.05.001 Published by Elsevier Science, Amsterdam [u.a.]
Astroparticle Physic... arrow_drop_down Astroparticle Physics; Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) - Universidade de São Paulo (USP)Article . 2017 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.astropartphys.2017.05.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 32 citations 32 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Astroparticle Physic... arrow_drop_down Astroparticle Physics; Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) - Universidade de São Paulo (USP)Article . 2017 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.astropartphys.2017.05.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object 2016 Netherlands, GermanyPublisher:Sissa Medialab Funded by:EC | LOFAREC| LOFARHörandel, J. R.; Buitink, S.; Corstanje, A.; Enriquez, J. E.; Falcke, H.; Karskens, T.; Krause, M.; Nelles, A.; Rachen, J. P.; Rossetto, L.; Schellart, P.; Scholten, O.; Ter Veen, S.; Thoudam, S.; Trinh, T. N G;Extensive air showers create short nanosecond-scale pulses in the radio frequencies. These pulses have been measured successfully in the past years at the Low-Frequency Array (LOFAR). Due to the short duration and emission of the signal in the atmosphere, methods based on flux calibration of known sources as used in radio astronomical observations cannot be applied to establish an absolute calibration. To overcome this, we present three approaches that were used to check and improve the antenna model of LOFAR, and to provide an absolute calibration for air shower measurements. Two include the calibration with made-made sources, while one is using the Galactic radio emission. A source has been used that allows the cross-calibration of LOPES, Tunka-Rex and LOFAR. In future work these results can be used as an absolute scale for measurements of astronomical transients with LOFAR.
https://pos.sissa.it... arrow_drop_down University of Groningen Research PortalConference object . 2015Data sources: University of Groningen Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.22323/1.236.0662&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 3 citations 3 popularity Average influence Average impulse Average Powered by BIP!more_vert https://pos.sissa.it... arrow_drop_down University of Groningen Research PortalConference object . 2015Data sources: University of Groningen Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.22323/1.236.0662&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Report , Preprint 2016 Belgium, Netherlands, GermanyPublisher:EDP Sciences Funded by:EC | LOFAR-AUGER, EC | LOFAREC| LOFAR-AUGER ,EC| LOFARArthur Corstanje; Stijn Buitink; J. E. Enriquez; Heino Falcke; Jörg R. Hörandel; Maria Krause; Anna Nelles; Jörg P. Rachen; Pim Schellart; Olaf Scholten; S. ter Veen; Satyendra Thoudam; T. N. G. Trinh;We describe a method for spectral cleaning and timing calibration of short time series data of the voltage in individual radio interferometer receivers. It makes use of phase differences in fast Fourier transform (FFT) spectra across antenna pairs. For strong, localized terrestrial sources these are stable over time, while being approximately uniform-random for a sum over many sources or for noise. Using only milliseconds-long datasets, the method finds the strongest interfering transmitters, a first-order solution for relative timing calibrations, and faulty data channels. No knowledge of gain response or quiescent noise levels of the receivers is required. With relatively small data volumes, this approach is suitable for use in an online system monitoring setup for interferometric arrays. We have applied the method to our cosmic-ray data collection, a collection of measurements of short pulses from extensive air showers, recorded by the LOFAR radio telescope. Per air shower, we have collected 2ms of raw time series data for each receiver. The spectral cleaning has a calculated optimal sensitivity corresponding to a power signal-to-noise ratio of 0.08 (or -11 dB) in a spectral window of 25 kHz, for 2 ms of data in 48 antennas. This is well sufficient for our application. Timing calibration across individual antenna pairs has been performed at 0.4ns precision; for calibration of signal clocks across stations of 48 antennas the precision is 0.1ns. Monitoring differences in timing calibration per antenna pair over the course of the period 2011 to 2015 shows a precision of 0.08ns, which is useful for monitoring and correcting drifts in signal path synchronizations. A cross-check method for timing calibration is presented, using a pulse transmitter carried by a drone flying over the array. Timing precision is similar, 0.3ns, but is limited by transmitter position measurements, while requiring dedicated flights. Astronomy and astrophysics 590, A41(2016). doi:10.1051/0004-6361/201527809 Published by EDP Sciences, Les Ulis
NARCIS; Astronomy an... arrow_drop_down NARCIS; Astronomy and AstrophysicsArticle . 2016Radboud Repository; Astronomy and AstrophysicsOther literature type . Article . 2016 . Peer-reviewedRadboud Repository; Astronomy and AstrophysicsArticle . 2016Vrije Universiteit Brussel Research PortalOther literature type . 2016Data sources: Vrije Universiteit Brussel Research Portalhttps://doi.org/10.48550/arxiv...Article . 2016License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201527809&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 8 citations 8 popularity Average influence Average impulse Top 10% Powered by BIP!more_vert NARCIS; Astronomy an... arrow_drop_down NARCIS; Astronomy and AstrophysicsArticle . 2016Radboud Repository; Astronomy and AstrophysicsOther literature type . Article . 2016 . Peer-reviewedRadboud Repository; Astronomy and AstrophysicsArticle . 2016Vrije Universiteit Brussel Research PortalOther literature type . 2016Data sources: Vrije Universiteit Brussel Research Portalhttps://doi.org/10.48550/arxiv...Article . 2016License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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description Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 Germany, Belgium, Netherlands, GermanyPublisher:Wiley Funded by:FCT | D4, EC | LOFAR-AUGER, EC | LOFARFCT| D4 ,EC| LOFAR-AUGER ,EC| LOFARBrian Hare; Harald E. Edens; Paul R. Krehbiel; W. Rison; Olaf Scholten; Stijn Buitink; Arthur Corstanje; Heino Falcke; Jörg R. Hörandel; Tim Huege; G. K. Krampah; Pragati Mitra; Katie Mulrey; Anna Nelles; H. Pandya; Jörg P. Rachen; Satyendra Thoudam; T. N. G. Trinh; S. ter Veen; Tobias Winchen;doi: 10.1002/essoar.10504601.1 , 10.1029/2020ea001523 , 10.5445/ir/1000136948 , 10.3204/pubdb-2022-00220 , 10.1002/essoar.10504601.2
handle: https://repository.ubn.ru.nl/handle/2066/235881 , 20.500.14017/c713d067-b6c0-4a56-b975-2e23eaa2c127 , 2066/235881 , 11370/1d3a1b22-a37e-4a7e-9d28-9cf06c29f7aa
pmc: PMC8365654
pmid: 34435079
doi: 10.1002/essoar.10504601.1 , 10.1029/2020ea001523 , 10.5445/ir/1000136948 , 10.3204/pubdb-2022-00220 , 10.1002/essoar.10504601.2
handle: https://repository.ubn.ru.nl/handle/2066/235881 , 20.500.14017/c713d067-b6c0-4a56-b975-2e23eaa2c127 , 2066/235881 , 11370/1d3a1b22-a37e-4a7e-9d28-9cf06c29f7aa
pmc: PMC8365654
pmid: 34435079
Since their introduction 22 years ago, lightning mapping arrays (LMA) have played a central role in the investigation of lightning physics. Even in recent years with the proliferation of digital interferometers and the introduction of the LOw Frequency ARray (LOFAR) radio telescope, LMAs still play an important role in lightning science. LMA networks use a simple windowing technique that records the highest pulse in either 80 ��s or 10 ��s fixed windows in order to apply a time-of-arrival location technique. In this work, we develop an LMA-emulator that uses lightning data recorded by LOFAR to simulate an LMA, and we use it to test three new styles of pulse windowing. We show that they produce very similar results as the more traditional LMA windowing, implying that LMA lightning mapping results are relatively independent of windowing technique. In addition, each LMA station has its GPS-conditioned clock. While the timing accuracy of GPS receivers has improved significantly over the years, they still significantly limit the timing measurements of the LMA. Recently, new time-of-arrival techniques have been introduced that can be used to self-calibrate systematic offsets between different receiving stations. Applying this calibration technique to a set of data with 32 ns uncertainty, observed by the Colorado LMA, improves the timing uncertainty to 19 ns. This technique is not limited to LMAs and could be used to help calibrate future multi-station lightning interferometers. Earth and Space Science 8(7), 2020EA001523 (2021). doi:10.1029/2020EA001523 Published by American Geophysical Union, Malden, Mass.
NARCIS arrow_drop_down Europe PubMed CentralArticle . 2021Full-Text: http://europepmc.org/articles/PMC8365654Data sources: PubMed CentralVrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10504601.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert NARCIS arrow_drop_down Europe PubMed CentralArticle . 2021Full-Text: http://europepmc.org/articles/PMC8365654Data sources: PubMed CentralVrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10504601.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 Germany, Czech Republic, Netherlands, BelgiumPublisher:Wiley Funded by:EC | LOFAR-AUGER, EC | LOFAREC| LOFAR-AUGER ,EC| LOFAROlaf Scholten; Brian Hare; Joseph R. Dwyer; C. Sterpka; Ivana Kolmasova; Ondrej Santolik; Radek Lan; Luděk Uhlíř; Stijn Buitink; Arthur Corstanje; Heino Falcke; Tim Huege; Jörg R. Hörandel; G. K. Krampah; Pragati Mitra; Katharine Mulrey; A. Nelles; H. Pandya; A. Pel; Jörg P. Rachen; T. N. G. Trinh; S. ter Veen; Satyendra Thoudam; Tobias Winchen;With LOFAR we have been able to image the development of lightning flashes with meter-scale accuracy and unprecedented detail. We discuss the primary steps behind our most recent lightning imaging method. To demonstrate the capabilities of our technique we show and interpret images of the first few milliseconds of two intracloud flashes. In all our flashes, the negative leaders propagate in the charge layer below the main negative charge. Among several interesting features we show that in about 2 ms after initiation the primary initial leader triggers the formation of a multitude (>10) negative leaders in a rather confined area of the atmosphere. From these only one or two continue to propagate after about 30 ms to extend over kilometers horizontally while another may propagate back to the initiation point. We also show that normal negative leaders can transition into an initial leader like state, potentially in the presence of strong electric fields. In addition, we show some initial breakdown pulses that occurred during the primary initial leader, and even during two ���secondary��� initial leaders that developed out of stepped leaders. Journal of geophysical research / D 126(4), 033126 (2021). doi:10.1029/2020JD033126 Published by Wiley, Hoboken, NJ
Journal of Geophysic... arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research PortalRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . PreprintLicense: CC BY NC NDData sources: UnpayWallRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . 2021 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefhttps://doi.org/10.48550/arxiv...Article . 2020License: arXiv Non-Exclusive DistributionData sources: DataciteJournal of Geophysical Research AtmospheresArticle . 2021Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10503153.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 16 citations 16 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Journal of Geophysic... arrow_drop_down Vrije Universiteit Brussel Research PortalOther literature type . 2021Data sources: Vrije Universiteit Brussel Research PortalRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . PreprintLicense: CC BY NC NDData sources: UnpayWallRepository of the Czech Academy of SciencesArticle . 2021Data sources: Repository of the Czech Academy of SciencesJournal of Geophysical Research AtmospheresArticle . 2021 . Peer-reviewedLicense: CC BY NC NDData sources: Crossrefhttps://doi.org/10.48550/arxiv...Article . 2020License: arXiv Non-Exclusive DistributionData sources: DataciteJournal of Geophysical Research AtmospheresArticle . 2021Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1002/essoar.10503153.1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Belgium, Germany, Netherlands, GermanyPublisher:American Geophysical Union (AGU) Funded by:EC | LOFAR-AUGER, NWO | Turning the Moon into a n..., EC | LOFAREC| LOFAR-AUGER ,NWO| Turning the Moon into a neutrino detector with LOFAR ,EC| LOFART. N. G. Trinh; Olaf Scholten; Stijn Buitink; Ute Ebert; Brian Hare; Paul R. Krehbiel; Hidde Leijnse; Antonio Bonardi; Arthur Corstanje; Heino Falcke; T. Huege; Jörg R. Hörandel; G. K. Krampah; Pragati Mitra; Katie Mulrey; A. Nelles; H. Pandya; Jörg P. Rachen; Laura Rossetto; Casper Rutjes; S. ter Veen; Tobias Winchen;An analysis is presented of electric fields in thunderclouds using a recently proposed method based on measuring radio emission from extensive air shower events during thunderstorm conditions. This method can be regarded as a tomography of thunderclouds using cosmic rays as probes. The data cover the period from December 2011 till August 2014. We have developed an improved fitting procedure to be able to analyze the data. Our measurements show evidence for the main negative‐charge layer near the −10° isotherm. This we have seen for a winter as well as for a summer cloud where multiple events pass through the same cloud and also the vertical component of the electric field could be reconstructed. On the day of measurement of some cosmic‐ray events showing evidence for strong fields, no lightning activity was detected within 100 km distance. For the winter events, the top heights were between 5 and 6 km, while in the summer, typical top heights of 9 km were seen. Large horizontal components in excess of 70 kV/m of the electric fields are observed in the middle and top layers. Journal of geophysical research / D 125(8), 20 (2020). doi:10.1029/2019JD031433 Published by Wiley, Hoboken, NJ
Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2020Full-Text: http://europepmc.org/articles/PMC7375151Data sources: PubMed CentralJournal of Geophysical Research Atmospheres; Vrije Universiteit Brussel Research PortalOther literature type . Article . 2020 . Peer-reviewedLicense: CC BYJournal of Geophysical Research AtmospheresArticle . 2020Data sources: Eindhoven University of Technology Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: University of Groningen Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2019jd031433&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen hybrid 28 citations 28 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2020Full-Text: http://europepmc.org/articles/PMC7375151Data sources: PubMed CentralJournal of Geophysical Research Atmospheres; Vrije Universiteit Brussel Research PortalOther literature type . Article . 2020 . Peer-reviewedLicense: CC BYJournal of Geophysical Research AtmospheresArticle . 2020Data sources: Eindhoven University of Technology Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: University of Groningen Research PortalJournal of Geophysical Research AtmospheresArticle . 2020Data sources: METIS Research Information Systemadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1029/2019jd031433&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2019 France, France, Germany, France, Spain, FrancePublisher:EDP Sciences Funded by:EC | ASTERICSEC| ASTERICSNigro, C.; Deil, C.; Zanin, R.; Hassan, T.; King, J.; Ruiz, J. E.; Saha, L.; Terrier, R.; Brügge, K.; Nöthe, M.; Bird, R.; Lin, T. T. Y.; Aleksić, J.; Boisson, C.; Contreras, J. L.; Donath, A.; Jouvin, L.; Kelley-Hoskins, Nathan; Khelifi, B.; Kosack, K.; Rico, J.; Sinha, A.;The analysis and combination of data from different gamma-ray instruments involves the use of collaboration proprietary software and case-by-case methods. The effort of defining a common data format for high-level data, namely event lists and instrument response functions (IRFs), has recently started for very-high-energy gamma-ray instruments, driven by the upcoming Cherenkov Telescope Array (CTA). In this work we implemented this prototypical data format for a small set of MAGIC, VERITAS, FACT, and H.E.S.S. Crab nebula observations, and we analyzed them with the open-source gammapy software package. By combining data from Fermi-LAT, and from four of the currently operating imaging atmospheric Cherenkov telescopes, we produced a joint maximum likelihood fit of the Crab nebula spectrum. Aspects of the statistical errors and the evaluation of systematic uncertainty are also commented upon, along with the release format of spectral measurements. The results presented in this work are obtained using open-access on-line assets that allow for a long-term reproducibility of the results.© ESO 2019. This work was supported by the Young Investigators Program of the Helmholtz Association, by the Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Center SFB 876 >Providing Information by Resource-Constrained Analysis>, project C3 and by the European Commision through the ASTERICS Horizon2020 project (id 653477). Peer Reviewed
E-Prints Complutense arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2019 . Peer-reviewedData sources: Recolector de Ciencia Abierta, RECOLECTARecolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2019 . Peer-reviewedRecolector de Ciencia Abierta, RECOLECTA; Docta ComplutenseOther literature type . Article . 2023 . 2019Astronomy and AstrophysicsArticle . 2019 . Peer-reviewedLicense: EDP Sciences Copyright and Publication Licensing PolicyData sources: CrossrefHAL-Inserm; Hal-DiderotArticle . 2019https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201834938&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 41 citations 41 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!visibility 23visibility views 23 download downloads 27 Powered bymore_vert E-Prints Complutense arrow_drop_down Recolector de Ciencia Abierta, RECOLECTAArticle . 2019 . Peer-reviewedData sources: Recolector de Ciencia Abierta, RECOLECTARecolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2019 . Peer-reviewedRecolector de Ciencia Abierta, RECOLECTA; Docta ComplutenseOther literature type . Article . 2023 . 2019Astronomy and AstrophysicsArticle . 2019 . Peer-reviewedLicense: EDP Sciences Copyright and Publication Licensing PolicyData sources: CrossrefHAL-Inserm; Hal-DiderotArticle . 2019https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201834938&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2019 France, France, GermanyPublisher:Springer Science and Business Media LLC Funded by:EC | LASERLAB-EUROPE, EC | VOXELEC| LASERLAB-EUROPE ,EC| VOXELJoana Duarte; R. Cassin; Julius Huijts; Bianca Iwan; F. Fortuna; L. Delbecq; Henry N. Chapman; Marta Fajardo; Milutin Kovacev; Willem Boutu; Hamed Merdji;Recovering the three-dimensional (3D) properties of artificial or biological systems using low X-ray doses is challenging as most techniques are based on computing hundreds of two-dimensional (2D) projections. The requirement for a low X-ray dose also prevents single-shot 3D imaging using ultrafast X-ray sources. Here we show that computed stereo vision concepts can be applied to X-rays. Stereo vision is important in the field of machine vision and robotics. We reconstruct two X-ray stereo views from coherent diffraction patterns and compute a nanoscale 3D representation of the sample from disparity maps. Similarly to brain perception, computed stereo vision algorithms use constraints. We demonstrate that phase-contrast images relax the disparity constraints, allowing occulted features to be revealed. We also show that by using nanoparticles as labels we can extend the applicability of the technique to complex samples. Computed stereo X-ray imaging will find application at X-ray free-electron lasers, synchrotrons and laser-based sources, and in industrial and medical 3D diagnosis methods. Nature photonics 13(7), 449 - 453 (2019). doi:10.1038/s41566-019-0419-1 Published by Nature Publ. Group, London [u.a.]
Nature Photonics arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41566-019-0419-1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 10 citations 10 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Nature Photonics arrow_drop_down https://doi.org/10.48550/arxiv...Article . 2019License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41566-019-0419-1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2017 Germany, France, BrazilPublisher:Elsevier BV Funded by:EC | ASTERICSEC| ASTERICSHassan , T.; Arrabito , L.; Bernlöhr , K.; Bregeon , J.; Cortina , J.; Cumani , P.; Di Pierro , F.; Falceta-Goncalves , D.; Lang , R.G.; Hinton , J.; Jogler , T.; Maier , G.; Moralejo , A.; Morselli , A.; Todero Peixoto , C.; Wood , M.;The Cherenkov Telescope Array (CTA) represents the next generation of ground-based instruments for very-high-energy (VHE) gamma-ray astronomy, aimed at improving on the sensitivity of current-generation experiments by an order of magnitude and providing coverage over four decades of energy. The current CTA design consists of two arrays of tens of imaging atmospheric Cherenkov Telescopes, comprising Small, Medium and Large-Sized Telescopes, with one array located in each of the Northern and Southern Hemispheres. To study the effect of the site choice on the overall CTA performance and support the site evaluation process, detailed Monte Carlo simulations have been performed. These results show the impact of different site-related attributes such as altitude, night-sky background and local geomagnetic field on CTA performance for the observation of VHE gamma rays. Astroparticle physics 93, 76 - 85 (2017). doi:10.1016/j.astropartphys.2017.05.001 Published by Elsevier Science, Amsterdam [u.a.]
Astroparticle Physic... arrow_drop_down Astroparticle Physics; Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) - Universidade de São Paulo (USP)Article . 2017 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.astropartphys.2017.05.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 32 citations 32 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Astroparticle Physic... arrow_drop_down Astroparticle Physics; Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) - Universidade de São Paulo (USP)Article . 2017 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.astropartphys.2017.05.001&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object 2016 Netherlands, GermanyPublisher:Sissa Medialab Funded by:EC | LOFAREC| LOFARHörandel, J. R.; Buitink, S.; Corstanje, A.; Enriquez, J. E.; Falcke, H.; Karskens, T.; Krause, M.; Nelles, A.; Rachen, J. P.; Rossetto, L.; Schellart, P.; Scholten, O.; Ter Veen, S.; Thoudam, S.; Trinh, T. N G;Extensive air showers create short nanosecond-scale pulses in the radio frequencies. These pulses have been measured successfully in the past years at the Low-Frequency Array (LOFAR). Due to the short duration and emission of the signal in the atmosphere, methods based on flux calibration of known sources as used in radio astronomical observations cannot be applied to establish an absolute calibration. To overcome this, we present three approaches that were used to check and improve the antenna model of LOFAR, and to provide an absolute calibration for air shower measurements. Two include the calibration with made-made sources, while one is using the Galactic radio emission. A source has been used that allows the cross-calibration of LOPES, Tunka-Rex and LOFAR. In future work these results can be used as an absolute scale for measurements of astronomical transients with LOFAR.
https://pos.sissa.it... arrow_drop_down University of Groningen Research PortalConference object . 2015Data sources: University of Groningen Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.22323/1.236.0662&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 3 citations 3 popularity Average influence Average impulse Average Powered by BIP!more_vert https://pos.sissa.it... arrow_drop_down University of Groningen Research PortalConference object . 2015Data sources: University of Groningen Research Portaladd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.22323/1.236.0662&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Report , Preprint 2016 Belgium, Netherlands, GermanyPublisher:EDP Sciences Funded by:EC | LOFAR-AUGER, EC | LOFAREC| LOFAR-AUGER ,EC| LOFARArthur Corstanje; Stijn Buitink; J. E. Enriquez; Heino Falcke; Jörg R. Hörandel; Maria Krause; Anna Nelles; Jörg P. Rachen; Pim Schellart; Olaf Scholten; S. ter Veen; Satyendra Thoudam; T. N. G. Trinh;We describe a method for spectral cleaning and timing calibration of short time series data of the voltage in individual radio interferometer receivers. It makes use of phase differences in fast Fourier transform (FFT) spectra across antenna pairs. For strong, localized terrestrial sources these are stable over time, while being approximately uniform-random for a sum over many sources or for noise. Using only milliseconds-long datasets, the method finds the strongest interfering transmitters, a first-order solution for relative timing calibrations, and faulty data channels. No knowledge of gain response or quiescent noise levels of the receivers is required. With relatively small data volumes, this approach is suitable for use in an online system monitoring setup for interferometric arrays. We have applied the method to our cosmic-ray data collection, a collection of measurements of short pulses from extensive air showers, recorded by the LOFAR radio telescope. Per air shower, we have collected 2ms of raw time series data for each receiver. The spectral cleaning has a calculated optimal sensitivity corresponding to a power signal-to-noise ratio of 0.08 (or -11 dB) in a spectral window of 25 kHz, for 2 ms of data in 48 antennas. This is well sufficient for our application. Timing calibration across individual antenna pairs has been performed at 0.4ns precision; for calibration of signal clocks across stations of 48 antennas the precision is 0.1ns. Monitoring differences in timing calibration per antenna pair over the course of the period 2011 to 2015 shows a precision of 0.08ns, which is useful for monitoring and correcting drifts in signal path synchronizations. A cross-check method for timing calibration is presented, using a pulse transmitter carried by a drone flying over the array. Timing precision is similar, 0.3ns, but is limited by transmitter position measurements, while requiring dedicated flights. Astronomy and astrophysics 590, A41(2016). doi:10.1051/0004-6361/201527809 Published by EDP Sciences, Les Ulis
NARCIS; Astronomy an... arrow_drop_down NARCIS; Astronomy and AstrophysicsArticle . 2016Radboud Repository; Astronomy and AstrophysicsOther literature type . Article . 2016 . Peer-reviewedRadboud Repository; Astronomy and AstrophysicsArticle . 2016Vrije Universiteit Brussel Research PortalOther literature type . 2016Data sources: Vrije Universiteit Brussel Research Portalhttps://doi.org/10.48550/arxiv...Article . 2016License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201527809&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen bronze 8 citations 8 popularity Average influence Average impulse Top 10% Powered by BIP!more_vert NARCIS; Astronomy an... arrow_drop_down NARCIS; Astronomy and AstrophysicsArticle . 2016Radboud Repository; Astronomy and AstrophysicsOther literature type . Article . 2016 . Peer-reviewedRadboud Repository; Astronomy and AstrophysicsArticle . 2016Vrije Universiteit Brussel Research PortalOther literature type . 2016Data sources: Vrije Universiteit Brussel Research Portalhttps://doi.org/10.48550/arxiv...Article . 2016License: arXiv Non-Exclusive DistributionData sources: Dataciteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1051/0004-6361/201527809&type=result"></script>'); --> </script>
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