1. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radiowave Propagation of the Russian Academy of Sciences (IZMIRAN) Troitsk Moscow Russia
2. Space Research Institute of the Russian Academy of Sciences (IKI) Moscow Russia
3. Higher School of Economics University (HSE) Moscow Russia
4. Center for Space Plasma and Aeronomic Research (CSPAR) University of Alabama in Huntsville Huntsville AL USA