00637naa#a2200205#i#450# EN\\bibl\75258 20260309221504.1 2712-9640 20240625b2024####ek#y0engy0150####ca RU HF radio path modeling by waveguide approach Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2024 9 с. Journal article local Физика. 53 Ponomarchuk Sergey Nikolaevich Kurkin Vladimir Ivanovich Ilyin Nikolay Viktorovich Penzin Maksim Sergeevich ras.editorum.ru