00635naa#a2200205#i#450# EN\\bibl\57896 20260315234921.7 2500-0535 20230930b2023####ek#y0engy0150####ca ENG RU Solar activity cycle 25: the first three years Journal article Irkutsk Institute of Solar-Terrestrial Physics SB RAS 2023 6 с. Journal article local Астрономия. Геодезия. 52 ENG Yazev Sergey Arkturovich Isaeva Elena Sergeevna Hos-Erdene Battulga iszf.editorum.ru