А.I. Berkut1, P.A. Morozov2, A.V. Popov3

1 JSC VNIISMI (Moscow, Russia)
2,3 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation of RAS (Moscow, Troitsk, Russia)
1 lozaberk@yandex.ru, 2 pmoroz5@yandex.ru, 3 popov@izmiran.ru