1. Institute of Physics of the Earth, 10 B. Gruzinskaya, 123242 Moscow, Russian Federation and Space Research Institute, 84/32 Profsouznaya str., 117997 Moscow, Russian Federation
2. Institute of Physics of the Earth, 10 B. Gruzinskaya, 123242 Moscow, Russian Federation
3. Institute for Fusion Studies and Applied Research Laboratory, University of Texas at Austin, Austin, Texas 78713, USA
4. School of Physics, Trinity College Dublin, Dublin 2, Ireland
5. Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield S13JD, United Kingdom