EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Lightning optical context associated with ASIM TGFs

Andrey Mezentsev1, Nikolai Østgaard1, Martino Marisaldi1, Pavlo Kochkin1, Torsten Neubert2, Olivier Chanrion2, Matthias Heumesser2, Victor Reglero3, Freddy Christiansen2, Georgi Genov1, and Kjetil Ullaland1
Andrey Mezentsev et al.
  • 1Birkeland Centre for Space Science, University of Bergen, Bergen, Norway (
  • 2National Space Institute, Technical University of Denmark, Denmark
  • 3University of Valencia, Valencia, Spain

Launched and installed at the International Space Station in April 2018, the Atmosphere-Space Interactions Monitor (ASIM) provides science data since June 2018. Suite of onboard instruments contains optical and high energy detectors payloads. Modular Multi-spectral Imaging Array (MMIA) includes three photometers (180-240 nm, 337 nm and 777.4 nm) sampling at 100 kHz, and two cameras (337 nm and 777.4 nm) sampling at 12 Hz. It allows for lightning and transient luminous events (TLEs) observations during the orbital eclipses. The Modular X- and Gamma-ray Sensor (MXGS) detects X- and Gamma-ray photons, and is dedicated to detection of Terrestrial Gamma-ray Flashes (TGFs). The mutual relative timing accuracy between MXGS and MMIA is as good as +/- 5 µs.


TGFs are known to be associated with the +IC lightning discharges. ASIM provides a unique possibility for simultaneous observations of TGFs together with the underlying optical activity inside the thundercloud. In this contribution we summarize the almost two years of ASIM observations to make an overview of the various optical contexts accompanying the TGF production.

How to cite: Mezentsev, A., Østgaard, N., Marisaldi, M., Kochkin, P., Neubert, T., Chanrion, O., Heumesser, M., Reglero, V., Christiansen, F., Genov, G., and Ullaland, K.: Lightning optical context associated with ASIM TGFs, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-8157,, 2020