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dc.contributor.authorLindanger, Anders
dc.contributor.authorSkeie, Chris Alexander Kallevik
dc.contributor.authorMarisaldi, Martino
dc.contributor.authorBjørge-Engeland, Ingrid
dc.contributor.authorØstgaard, Nikolai
dc.contributor.authorMezentsev, Andrey
dc.contributor.authorSarria, David Alexandre Stephan
dc.contributor.authorLehtinen, Nikolai Grigorievich
dc.contributor.authorReglero, Victor
dc.contributor.authorChanrion, Olivier
dc.contributor.authorNeubert, Torsten
dc.description.abstractTerrestrial Gamma-ray Flashes (TGFs) are short emissions of high energy photons associated with thunderstorms. It has been known since the discovery of TGFs that they are associated with lightning, and several case studies have shown that the TGFs are produced at the initial phase of the lightning flash. However, it has not been tested whether this is true in general. By using the largest TGF sample up to date, combined with ground-based radio lightning detection data, we perform a statistical study to test this. One of the TGF missions is the Atmosphere-Space Interactions Monitor (ASIM) consisting of the innovative combination of X- and gamma-ray detectors, optical photometers and cameras. This allows us to investigate the temporal relation between gamma-rays produced by TGFs and the optical signal produced by lightning discharges. Based on stacking analysis of the TGF sample and ground-based measurements of associated lightning activity, together with the high temporal resolution of the optical signal from the ASIM photometers, it is shown that TGFs are produced in the beginning of the lightning flashes. In addition, for a significant fraction of the TGFs, the lightning activity detected in radio is enhanced in an interval between 150 and 750 ms following the TGFs, and is co-located with the lightning associated with the TGFs. The enhanced lightning activity is not evident in a randomly selected sample of flashes. This indicates that the activity between 150 and 750 ms is a characteristic property of a significant fraction of flashes that start with a TGF.en_US
dc.publisherAmerican Geophysical Unionen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleProduction of Terrestrial Gamma-Ray Flashes During the Early Stages of Lightning Flashesen_US
dc.typeJournal articleen_US
dc.rights.holderCopyright 2022 the authorsen_US
dc.source.journalJournal of Geophysical Research: Atmospheresen_US
dc.identifier.citationJournal of Geophysical Research: Atmospheres. 2022, 127 (8), e2021JD036305.en_US

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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal