EGU21-4785, updated on 18 Mar 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Constraining spectral models of a terrestrial gamma-ray flash from a terrestrial electron beam observation by the Atmosphere-Space Interactions Monitor

David Sarria1, Nikolai Østgaard1, Pavlo Kochkin1, Nikolai Lehtinen1, Andrew Mezentsev1, Martino Marisaldi1, Anders Lindanger1, Carolina Maiorana1, Brant E. Carlson2, Torsten Neubert3, Victor Reglero4, Kjetil Ullaland1, Shiming Yang1, Georgi Genov1, Bilal Hasan Qureshi1, Carl Budtz-Jørgensen3, Irfan Kuvvetli3, Freddy Christiansen3, Olivier Chanrion3, Javier Navarro-Gonzalez4, and the Atmosphere-Space Interactions Monitor (ASIM) team*
David Sarria et al.
  • 1University of Bergen, Birkeland Centre for Space Science, Hard Radiation group , Bergen, Norway (
  • 2Carthage College, Kenosha, Wisconsin, United States
  • 3National Space Institute, Technical University of Denmark, Lyngby, Denmark
  • 4University of Valencia, Valencia, Spain
  • *A full list of authors appears at the end of the abstract

Terrestrial Gamma-ray Flashes (TGFs) are short flashes of high energy photons, produced by thunderstorms. When interacting with the atmosphere, they produce relativistic electrons and positrons, and a part gets bounded to geomagnetic field lines and travels large distances in space. This phenomenon is called a Terrestrial Electron Beam (TEB). The Atmosphere-Space Interactions Monitor (ASIM) mounted on-board the International Space Station detected a new TEB event on March 24, 2019, originating from a tropical cyclone, Johanina. Using ASIM's low energy detector, the TEB energy spectrum is resolved down to 50 keV. We provide a new method to contrain the TGF source spectrum based on the detected TEB spectrum. Applied to this event, it shows that only fully developed RREA spectrums are compatible with the observation. More specifically, assuming a TGF spectrum proportional to 1/E exp(-E/ε), the compatible models have ε ≥ 6.5 MeV. We could not exclude models with ε of 8 and 10 MeV. This is the first time the source energy spectrum of a TGF is contrained based on the detection of the associated TEB.

Atmosphere-Space Interactions Monitor (ASIM) team:

D. Sarria, N. Østgaard, P. Kochkin, N. Lehtinen, A. Mezentsev, M. Marisaldi, A. Lindanger, C. Maiorana, B. E. Carlson, T. Neubert, V. Reglero, K. Ullaland, S.Yang, G. Genov, Bilal Hasan Qureshi, C. Budtz-Jørgensen, I. Kuvvetli, F. Christiansen, O. Chanrion, J. Navarro-González, P. Connel, and C. Eyles

How to cite: Sarria, D., Østgaard, N., Kochkin, P., Lehtinen, N., Mezentsev, A., Marisaldi, M., Lindanger, A., Maiorana, C., Carlson, B. E., Neubert, T., Reglero, V., Ullaland, K., Yang, S., Genov, G., Qureshi, B. H., Budtz-Jørgensen, C., Kuvvetli, I., Christiansen, F., Chanrion, O., and Navarro-Gonzalez, J. and the Atmosphere-Space Interactions Monitor (ASIM) team: Constraining spectral models of a terrestrial gamma-ray flash from a terrestrial electron beam observation by the Atmosphere-Space Interactions Monitor, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-4785,, 2021.

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