V.V. Varenkov1, D.S. Gorkin2, A.D. Smirnov3, T.V. Sahterova4, V.I. Sahterov5

1–5 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation Russian Academy of Sciences (IZMIRAN) (Moscow, Troitsk, Russia)
1 varenkov@mail.ru; 2 gorkin@izmiran.ru; 3 diman.smirny@yandex.ru; 4 sachter_t@mail.ru; 5 sakhterov@mail.ru