TY JOUR TI HF radio channel modeling by a waveguide approach KW radio wave propagation KW radio channel KW waveguide approach KW simulation KW ionosphere sounding JO Solnechno-Zemnaya Fizika AU Kurkin, V.I. AU Ilyin, N.V. AU Penzin, M.S. AU Ponomarchuk, S.N. AU Khakhinov, V.V. PY 2023 IS 9 PB INFRA-M Academic Publishing LLC.