TY JOUR TI Spectral features of ionospheric plasma waves excited by powerful HF radio waves radiated at frequencies near electron gyroharmonics and F2-layer critical frequency KW high-latitude ionosphere KW F-region KW powerful HF radio wave KW Langmuir wave KW ion-acoustic wave KW incoherent scatter KW EISCAT JO Solnechno-Zemnaya Fizika AU Borisova, T.D. AU Blagoveshchenskaya, N.F. AU Kalishin, A.S. PY 2023 IS 9 PB INFRA-M Academic Publishing LLC.