00816naa#a2200205#i#450# EN\INFRA-M\bibl\109010 20251230003358.2 2712-9640 20251210b2025####ek#y0engy0150####ca RU Trends in the F2-layer critical frequency from data obtained at the ionospheric station Yakutsk during the period from 1956 to 2017 Journal article Moscow INFRA-M Academic Publishing LLC. 2025 8 с. Journal article local Ионосфера: теории, влияния ионосферы, распределение и т. д.. 550.388.2 Kobyakova Sargylana Egorovna Gololobov Artem Yuryevich Karimov Rustam Ramilyevich Stepanov Aleksandr Egorovich zh-szf.ru