Blar i Faculty of Mathematics and Natural Sciences på forfatter "Collier, Andrew B."
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An altitude and distance correction to the initial fluence distribution of TGFs
Nisi, Ragnhild Schrøder; Østgaard, Nikolai; Gjesteland, Thomas; Collier, Andrew B. (Peer reviewed; Journal article, 2014-10)The 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 ... -
A new population of terrestrial gamma-ray flashes in the RHESSI data
Østgaard, Nikolai; Albrechtsen, Kjetil; Gjesteland, Thomas; Collier, Andrew B. (Peer reviewed; Journal article, 2015-12-23)Terrestrial gamma-ray flashes (TGFs) are the most energetic photon phenomenon occurring naturally on Earth. An outstanding question is as follows: Are these flashes just a rare exotic phenomenon or are they an intrinsic ... -
Observation of intrinsically bright terrestrial gamma ray flashes from the Mediterranean basin
Gjesteland, Thomas; Østgaard, Nikolai; Laviola, Sante; Miglietta, M M; Arnone, Enrico; Marisaldi, Martino; Fuschino, F; Collier, Andrew B.; Fabro, F; Montanya, J (Peer reviewed; Journal article, 2015-12-14)We present three terrestrial gamma ray flashes (TGFs) observed over the Mediterranean basin by the Reuven Ramaty High Energy Solar Spectroscope Imager (RHESSI) satellite. Since the occurrence of these events in the ...