00715naa#a2200205#i#450# EN\INFRA-M\bibl\45035 20241125051527.1 2500-0535 20211220b2021####ek#y0engy0150####ca ENG RU Complexes of activity on the Sun in solar cycle 21 Journal article Moscow INFRA-M Academic Publishing LLC. 2021 6 с. Journal article local Астрономия. Астрофизика. Исследование космичечского пространства. 520 ENG Yazev Sergey Arkturovich Ulianova Maria Mihaylovna Isaeva Elena Sergeevna zh-szf.ru