00621naa#a2200205#i#450# EN\INFRA-M\bibl\57896 20250103163347.5 2500-0535 20230930b2023####ek#y0engy0150####ca ENG RU Solar activity cycle 25: the first three years Journal article Moscow INFRA-M Academic Publishing LLC. 2023 6 с. Journal article local Астрономия. Геодезия. 52 ENG Yazev Sergey Arkturovich Isaeva Elena Sergeevna Hos-Erdene Battulga zh-szf.ru