A.V. Kurangishev - Student, Kazan National Research Technical University named after A.N. Tupolev. E-mail: adiasusik@gmail.com A.V. Dedushkin - Master, Kazan National Research Technical University named after A.N. Tupolev. E-mail: andrei-shymaher@yandex.ru

V.V. Varenkov1, D.S. Gorkin2

1,2 Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation (Moscow, Russia)

1 varenkov@mail.ru, 2 gorkin@izmiran.ru