D.E. Edemsky1, V.E. Tumskoy2, I.V. Prokopovich3

1,3 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS (Moscow, Troitsk, Russia)
2 Melnikov Permafrost Institute, SB RAS (Yakutsk, Russia)
1 deedemsky@gmail.com; 2 vtumskoy@gmail.com; 3 prokop@izmiran.ru