TY JOUR TI HF radio path modeling by waveguide approach KW radio wave propagation KW waveguide approach KW radio path forecast KW ionogram KW radio channel diagnostics JO Solar-Terrestrial Physics AU Ponomarchuk, S.N. AU Kurkin, V.I. AU Ilyin, N.V. AU Penzin, M.S. PY 2024 IS 10 PB INFRA-M Academic Publishing LLC.