TY JOUR TI Space weather research in Yakutia KW geomagnetic Pc5 pulsations KW equivalent current systems KW azimuthal and meridional propagation KW space weather monitoring KW space weather forecast KW lower ionosphere KW solar flare KW VLF signal KW sudden phase anomaly JO Solar-Terrestrial Physics AU Moiseev, A.V. AU Gololobov, A.Y. AU Ievenko, I.B. AU Korsakov, A.A. AU Petuhov, I.S. AU Starodubtsev, S.A. PY 2025 IS 11 PB INFRA-M Academic Publishing LLC.