Affiliation: | 1. Astrophysical Center of the P.N. Lebedev Institute of Physics of the Russian Academy of Sciences, Moscow, Russia 2. Pedagogical State University of Moscow, Moscow, Russia 3. Netherlands Institute for Space Research (SRON), Groningen, the Netherlands 4. Sapienza University of Rome, Rome, Italy 5. Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia 6. R. E. Alekseyev Technical University of Nizhny Novgorod, Nizhny Novgorod, Russia 7. Chalmers University of Technology, Gothenburg, Sweden 8. V. A. Kotel’nikov Institute for Radioengineering and Electronics, Moscow, Russia 9. M. V. Lomonosov State University of Moscow, Moscow, Russia
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