TY JOUR TI Microwave indicator of potential geoeffectiveness and magnetic flux-rope structure of a solar active region KW solar active regions KW magnetic fields KW microwave emission KW solar flare forecast JO Solar-Terrestrial Physics AU Kudriavtseva, A.V. AU Myshyakov, I.I. AU Uralov, A.M. AU Grechnev, V.V. PY 2021 IS 7 PB INFRA-M Academic Publishing LLC.