00829naa#a2200205#i#450# EN\\bibl\109010 20260313071145.5 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 Irkutsk Institute of Solar-Terrestrial Physics SB RAS 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 ras.editorum.ru