Тип публикации: статья из журнала

Год издания: 2025

Идентификатор DOI: 10.1029/2025jd044425

Аннотация: <jats:title>Abstract</jats:title> <jats:p> We examine a newly discovered category of high-energy radiation events called flickering gamma-ray flashes (FGF) detected during the airborne lightning observatory for FEGS and TGFs campaign in July 2023. These FGFs are characterized by highly pulsating gamma-ray emissions that have no detПоказать полностьюectable concurrent optical or radio signals (Ostgaard et al., 2024, <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="https://doi.org/10.1038/s41586-024-07893-0">https://doi.org/10.1038/s41586-024-07893-0</jats:ext-link> ). They are consistently followed by a Narrow Bipolar Event (NBE) occurring a few to 50 milliseconds after the last gamma-ray pulse. We perform a comprehensive spectral analysis of the FGFs using forward modeling and Monte Carlo simulations. We assume the NBE occurs either at the same location as the gamma-ray emission or close to it ( kilometer). Of 24 FGF events, we have position constraints for 21 and additional altitude constraints for 3. With sufficient photon counts, we can determine source photon brightness within a few orders of magnitude, down to one order of magnitude for some events. All FGFs are consistent with a fully developed relativistic runaway electron avalanche spectrum with varying atmospheric attenuation, even at low photon source brightnesses ( to, above 100 keV). FGFs are produced in the atmosphere (8–16 km altitude) with a large range of source photon brightness, from to about.We estimate they are on average 3 orders of magnitude below the ASIM-MXGS space detection threshold, though a small part of the FGF population could be detected from space. FGFs have been detected by CGRO-BATSE, and recently confirmed in ASIM data with several candidates. We encourage researchers to search for these events in data sets collected by current space, air and ground instruments. </jats:p>

Журнал: Journal of Geophysical Research: Atmospheres

Выпуск журнала: Т. 130, № 23

Номера страниц: 2025

ISSN журнала: 21698996

• Sarria D. (Department of Physics and Technology University of Bergen Bergen Norway)
• Østgaard N. (Department of Physics and Technology University of Bergen Bergen Norway)
• Bjørge-Engeland I. (Department of Physics and Technology University of Bergen Bergen Norway)
• Mezentsev A. (Department of Physics and Technology University of Bergen Bergen Norway)
• Marisaldi M. (Astrophysics and Space Science Observatory National Institute for Astrophysics Bologna Italy)
• Lehtinen N. (Department of Physics and Technology University of Bergen Bergen Norway)
• Stanley M. (New Mexico Institute of Mining and Technology Socorro NM USA)
• Lang T. (NASA Marshall Space Flight Center Huntsville AL USA)
• Schultz C. (NASA Marshall Space Flight Center Huntsville AL USA)
• Fuglestad A. (Department of Physics and Technology University of Bergen Bergen Norway)

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