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dc.contributor.authorNisi, Ragnhild Schrødereng
dc.contributor.authorØstgaard, Nikolaieng
dc.contributor.authorGjesteland, Thomaseng
dc.contributor.authorCollier, Andrew B.eng
dc.description.abstractThe source fluence distribution of terrestrial gamma ray flashes (TGFs) has been extensively discussed in recent years, but few have considered how the TGF fluence distribution at the source, as estimated from satellite measurements, depends on the distance from satellite foot point and assumed production altitude. As the absorption of the TGF photons increases significantly with lower source altitude and larger distance between the source and the observing satellite, these might be important factors. We have addressed the issue by using the tropopause pressure distribution as an approximation of the TGF production altitude distribution and World Wide Lightning Location Network spheric measurements to determine the distance. The study is made possible by the increased number of Ramaty High Energy Solar Spectroscopic Imager (RHESSI) TGFs found in the second catalog of the RHESSI data. One find is that the TGF/lightning ratio for the tropics probably has an annual variability due to an annual variability in the Dobson-Brewer circulation. The main result is an indication that the altitude distribution and distance should be considered when investigating the source fluence distribution of TGFs, as this leads to a softening of the inferred distribution of source brightness.en_US
dc.rightsAttribution-NonCommercial-NoDerivs CC BY-NC-NDeng
dc.titleAn altitude and distance correction to the initial fluence distribution of TGFsen_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2014 The Authorsen_US
dc.source.journalJournal of Geophysical Research
dc.relation.projectNorges forskningsråd: 216872
dc.relation.projectNorges forskningsråd: 208028
dc.relation.projectEU: 320839
dc.relation.projectNorges forskningsråd: 223252
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Physics: 430::Astrophysics, astronomy: 438en_US
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Fysikk: 430::Astrofysikk, astronomi: 438nob

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