Assigning the causative lightning to the whistlers observed on satellites
- 1Institute of Atmospheric Physics, Bocni II/1401, 14131 Prague, Czech Republic
- 2Charles University, Faculty of Mathematics and Physics, V Holesovickach 2, 18000 Prague, Czech Republic
- 3LPCE/CNRS, 3A Avenue de la Recherche Scientifique, 45071 Orléans, France
- 4Austrian Electrotechnical Association (OVE-ALDIS), Kahlenberger Str. 2A, 1190 Vienna, Austria
Abstract. We study the penetration of lightning induced whistler waves through the ionosphere by investigating the correspondence between the whistlers observed on the DEMETER and MAGION-5 satellites and the lightning discharges detected by the European lightning detection network EUCLID. We compute all the possible differences between the times when the whistlers were observed on the satellite and times when the lightning discharges were detected. We show that the occurrence histogram for these time differences exhibits a distinct peak for a particular characteristic time, corresponding to the sum of the propagation time and a possible small time shift between the absolute time assigned to the wave record and the clock of the lightning detection network. Knowing this characteristic time, we can search in the EUCLID database for locations, currents, and polarities of causative lightning discharges corresponding to the individual whistlers. We demonstrate that the area in the ionosphere through which the electromagnetic energy induced by a lightning discharge enters into the magnetosphere as whistler mode waves is up to several thousands of kilometres wide.