N.V. Savina, A.G. Goncharova, L. Kh. Bragin, A.M. Nosovsky, A.E. Severin
P.V. Denisenko - D.Sc. (Phys.-Math.), Professor, Department of radiophysics and space research, Research Institute of Physics, Southern Federal University. E-mail: denis@ip.rsu.ru
A.A. Khomyakov - Post-graduate Student, Faculty of Physics, Southern Federal University. E-mail: artem_rsu@mail.ru
