# Evaluating the effects of lightning-generated whistlers observed by the DEMETER spacecraft

Jan Zahlava, Frantisek Nemec, Jean-Louis Pincon, Ondrej Santolik, Ivana

Kolmasova, Michel Parrot

► To cite this version:

Jan Zahlava, Frantisek Nemec, Jean-Louis Pincon, Ondrej Santolik, Ivana Kolmasova, et al.. Evaluat-
ing the effects of lightning-generated whistlers observed by the DEMETER spacecraft. EGU General
Assembly 2016, Apr 2016, Vienne, United States. insu-03573539

HAL Id: insu-03573539

https://insu.hal.science/insu-03573539

Submitted on 15 Feb 2022

**HAL** is a multi-disciplinary open access
archive for the deposit and dissemination of sci-
entific research documents, whether they are pub-
lished or not. The documents may come from
teaching and research institutions in France or
abroad, or from public or private research centers.

L'archive ouverte pluridisciplinaire HAL, est
destinée au dépôt et à la diffusion de documents
scientifiques de niveau recherche, publiés ou non,
émanant des établissements d'enseignement et de
recherche français ou étrangers, des laboratoires
publics ou privés.

<figure><img src="image_1.png" /></figure>

Distributed under a Creative Commons Attribution 4.0 International License
<figure><img src="image_2.png" /></figure>

Evaluating the effects of lightning-generated whistlers observed by the DEMETER spacecraft

Jan Zahlava (1), Frantisek Nemec (1), Jean-Louis Pincon (2), Ondrej Santolik (3,1), Ivana Kolmasova (3,1), and Michel Parrot (2)

(1) Faculty of Mathematics and Physics, Charles University in Prague, Prague, Czech Republic, (2) LPC2E/CNRS, Orleans, France, (3) Institute of Atmospheric Physics, Czech Academy of Sciences, Prague, Czech Republic

Although lightning-generated whistlers have been studied for nearly a century, there are still questions to be an-
swered. It is clear that, at least in a certain frequency range, these waves significantly contribute to the overall wave
intensity in the inner magnetosphere. They also influence distribution functions of energetic particles in the van
Allen radiation belts. Due to the on board implemented neural network for automated whistler detection, the data
set obtained by the low-altitude DEMETER spacecraft allows us to relate measured electromagnetic wave data
and energetic particle flux with the number and dispersion of whistlers detected during a certain time interval. We
distinguish the cases with high and low whistler occurrence and we use this information to determine the overall
effect of lightning-generated whistlers.