• 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 ...
    • The ASIM mission on the international space station 

      Neubert, Torsten; Østgaard, Nikolai; Reglero, Victor; Blanc, Elisabeth; Chanrion, Olivier; Oxborrow, Carol Anne; Orr, Astrid; Tacconi, Matteo; Hartnack, Ole; Bhanderi, Dan D.V. (Peer reviewed; Journal article, 2019-03-12)
      The Atmosphere-Space Interactions Monitor (ASIM) is an instrument suite on the International Space Station (ISS) for measurements of lightning, Transient Luminous Events (TLEs) and Terrestrial Gamma-ray Flashes (TGFs). ...
    • High voltage electrical discharges in the laboratory 

      Grøndahl, Øystein (Master thesis, 2014-12-18)
      A new phenomenon called terrestrial gamma-ray flashes (TGFs) was discovered early in the 1990s by the NASA satellite Compton Gamma-Ray Observatory. The short-duration bursts of highly energetic gamma-rays are caused by ...
    • Modeling the relativistic runaway electron avalanche and the feedback mechanism with GEANT4 

      Skeltved, Alexander Broberg; Østgaard, Nikolai; Gjesteland, Thomas; Celestin, Sebastien; Carlson, Brant Edward (Peer reviewed; Journal article, 2014-11)
      This paper presents the first study that uses the GEometry ANd Tracking 4 (GEANT4) toolkit to do quantitative comparisons with other modeling results related to the production of terrestrial gamma ray flashes and high-energy ...
    • Multi Pulse Terrestrial Gamma-ray Flashes and optical pulses of lightning observed by ASIM 

      Fuglestad, Anders Nødland (Master thesis, 2023-06-02)
      This thesis presents 52 multi pulse Terrestrial Gamma-ray Flashes (TGFs) identified from The Atmosphere-Space Interactions Monitor (ASIM) since launch until the end of 2022.
    • Search for unidentified Terrestrial Gamma-ray Flashes 

      Albrechtsen, Kjetil Haakonseth (Master thesis, 2015-06-01)
      Terrestrial Gamma-ray Flashes (TGFs) are the most energetic natural phenomena on Earth with possible energies above 40MeV. They consist of large amounts of energetic photons ( 10^17 to 10^19 ) produced in thunderstorms at ...