P.F. Denisenko - Dr. Sc. (Phys.-Math.), Professor, Head of Department of Radiophysics and Space Research, Research Institute of Physics SFU (Rostov-on-Don). E-mail: denis@ip.rsu.ru
A.A. Khomyakov - Post-graduate Student, Faculty of Physics, Southern Federal University (Rostov-on-Don). E-mail: artem_rsu@mail.ru