V.B. Lapshin - Dr. Sc. (Phys.-Math.), Professor, Director Institute of Applied Geophysics n.a. E.K. Fedorov (Moscow) E-mail: director@ipg.geospace.ru N.G. Kotonaeva - Dr. Sc. (Phys.-Math.), Deputy Head of Department, Institute of Applied Geophysics n.a. E.K. Fedorov (Moscow) E-mail: kongt@yandex.ru E.S. Perminova - Junior Research Scientist, Institute of Applied Geophysics n.a. E.K. Fedorov (Moscow) E-mail: ekaterina.perminova@phystech.edu