1. Department of Physics, Samara National Research University, Samara 443086, Russia
2. Department of Theoretical Physics, Lebedev Physical Institute of Russian Academy of Sciences, Samara Branch, Samara 443011, Russia
3. Physics Department, Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry CV4 7AL, United Kingdom
4. St. Petersburg Branch, Special Astrophysical Observatory, Russian Academy of Sciences, St. Petersburg 196140, Russia