EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Observation of TGFs at Mid Latitude

Carolina Maiorana1, Martino Marisaldi1,2, Martin Füllekrug3, Serge Soula4, Jeff Lapierre5, Andrey Mezentsev1, Chris Alexander Skeie1, Matthias Heumesser6, Olivier Chanrion6, Nikolai Østgaard1, Torsten Neubert6, and Victor Reglero7
Carolina Maiorana et al.
  • 1University of Bergen, Institute for Physics and Technology, Birkeland Centre for Space Science, Bergen, Norway (
  • 2National Institute of Astrophysics, Bologna, Italy
  • 3University of Bath, Bath, UK
  • 4Laboratory of Aerology, University of Toulouse/CNRS, Toulouse, France
  • 5Earth Networks, Germantown, MD, USA
  • 6Technical University of Denmark, Lyngby, Denmark
  • 7University of Valencia, Valencia, Spain

We present a sample of Terrestrial Gamma-ray Flashes (TGFs) observed at mid latitudes by the Atmosphere Space Interaction Monitor (ASIM). The events were detected over the period June 2018 - August 2020 in the latitude bands between 35° and 51° and between -35° and -51°; the sample includes the first observations above ±38°. The characteristics of these mid-latitude events are consistent with the global population concerning the number of counts, but durations are significantly shorter. We also analyze the meteorological context and the general evolution of the parent storms and we show that the storms are not extreme in terms of total duration and extension. Finally, we present an estimation of the TGF occurrence rate at mid latitudes, based on ASIM's exposure, the local flash rate and tropopause altitude, and we show that it is outside but very close to two standard deviation from the rate of production at tropical latitudes, corrected by the higher atmospheric absorption of higher latitudes. This means that atmospheric absorption plays a major role in the detection of TGFs at mid latitudes, but we cannot rule out other factors.

How to cite: Maiorana, C., Marisaldi, M., Füllekrug, M., Soula, S., Lapierre, J., Mezentsev, A., Skeie, C. A., Heumesser, M., Chanrion, O., Østgaard, N., Neubert, T., and Reglero, V.: Observation of TGFs at Mid Latitude, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-2540,, 2021.

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