TY JOUR TI Dependence of the F2-layer critical frequency median at midlatitudes on geomagnetic activity KW midlatitude ionosphere KW F2 layer KW critical frequency KW median KW geomagnetic activity KW regularity JO Solnechno-Zemnaya Fizika AU Deminov, M.G. AU Deminova, G.F. AU Depuev, V.K. AU Depueva, A.K. PY 2017 IS 3 PB INFRA-M Academic Publishing LLC.