Affiliation: | 1. Kislovodsk Mountain Astronomical Station (MAS), Central (Pulkovo) Astronomical Observatory, Russian Academy of Sciences (MAO RAS), P.O. Box 145, Kislovodsk, 357700, Russia 2. Institute of Solar–Terrestrial Physics, Siberian Branch, Russian Academy of Sciences (ISTP SB RAS), ul. Lermontova 126A, Irkutsk, 664033, Russia 3. Institute of Applied Geophysics (IAG), Rostokinskaya ul. 9, Moscow, 129128, Russia
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