TY JOUR TI Features of excitation and azimuthal and meridional propagation of long-period Pi3 oscillations of the geomagnetic field on December 8, 2017 KW Pi3 pulsations KW steady magnetospheric convection KW convection electrojets KW particle injections KW azimuthal and meridional propagation KW wave disturbances in the interplanetary medium JO Solar-Terrestrial Physics AU Moiseev, A.V. AU Starodubtsev, S.A. AU Mishin, V.V. PY 2020 IS 6 PB INFRA-M Academic Publishing LLC.