00842naa#a2200217#i#450# EN\INFRA-M\bibl\109303 20260127070155.2 2500-0535 20251210b2025####ek#y0engy0150####ca ENG 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 7 с. Journal article local Ионосфера: теории, влияния ионосферы, распределение и т. д.. 550.388.2 ENG Kobyakova Sargylana Egorovna Gololobov Artem Yuryevich Karimov Rustam Ramilyevich Stepanov Aleksandr Egorovich naukaru.ru