1. Institute for Nuclear Research of RAS, Baksan Neutrino Observatory, Neutrino, KBR, RU-361609, Russia
2. Polar Geophysical Institute of RAS, Fersmana 14, Apatity, Murmansk region, RU-184209, Russia
3. Institute of Terrestrial Magnetism, Ionosphere and Radio Waves Propagation (IZMIRAN), Troitsk, Moscow Region, RU-142092, Russia