TY JOUR TI Amplitude variations of the reflected signal during vertical sounding of the ionosphere at middle latitudes KW ionosonde KW ionogram KW ionosphere KW magnetoionic modes KW A-maps JO Solar-Terrestrial Physics AU Yusupov, K.M. AU Mathews, J.D. AU Maruyama, T.. AU Akchurin, A.D. AU Tolstikov, M.V. AU Sherstyukov, O.N. AU Filippova, E.A. AU Safiullin, A.S. PY 2020 IS 6 PB INFRA-M Academic Publishing LLC.