Affiliation: | (1) St. Petersburg Filial (Branch) of Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Waves Propagation, Russian Academy of Sciences, St. Petersburg, Russia;(2) Ioffe Physico-Technical Institute Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia;(3) Polar Geophysical Institute, Kola Science Center, Russian Academy of Sciences, Murmansk, Russia |