TY JOUR TI Geometric factor in seasonal variations of daily average values of the geomagnetic index Dā‚›ā‚œ KW geomagnetic index Dst KW semiannual variation of magnetic activity JO Solnechno-Zemnaya Fizika AU Makarov, G.A. PY 2020 IS 6 PB INFRA-M Academic Publishing LLC.