1. Institute of Atmospheric Physics; Prague Czech Republic
2. Institute of Applied Physics RAS; Novgorod Russia
3. Department of Space Physics; Lobachevsky State University of Nizhny Novgorod; Novgorod Russia
4. Faculty of Mathematics and Physics; Charles University in Prague; Prague Czech Republic
5. LPC2E/CNRS; Orléans France
6. Polar Geophysical Institute of the Kola Science Centre RAS; Apatity Russia