TY JOUR TI Offsets in the geomagnetic indices of the magnetospheric ring current KW geomagnetic index Dst KW geomagnetic indices SYM and ASY KW magnetospheric ring current JO Solnechno-Zemnaya Fizika AU Makarov, G.A. PY 2021 IS 7 PB Institute of Solar-Terrestrial Physics SB RAS