Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 45035 10.12737/stp-74202101 Results of current research Results of current research Results of current research Complexes of activity on the Sun in solar cycle 21 Complexes of activity on the Sun in solar cycle 21 Язев Сергей Арктурович Yazev Sergey Arkturovich syazev@gmail.com

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Ульянова Мария Михайловна Ulianova Maria Mihaylovna dimka3509@yandex.ru Исаева Елена Сергеевна Isaeva Elena Sergeevna ele3471@yandex.ru Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar Terrestrial Physics SB RAS Irkutsk Russian Federation Иркутский государственный университет Иркутск Россия Irkutsk State University Irkutsk Russian Federation Иркутский государственный университет Иркутск Россия Irkutsk State University Irkutsk Russian Federation Иркутский государственный университет Иркутск Россия Irkutsk State University Irkutsk Russian Federation 7 4 3 9 12 07 2021 16 09 2021 https://zh-szf.ru/en/nauka/article/45035/view

The paper provides statistical data on solar activity complexes (ACs) observed in solar cycle 21. From the synoptic charts for the 1976–1986 sunspot activity, we have detected the regions where the sunspot generation was observed at least through three Carrington Rotations (CRs). These regions were identified as AC cores. We have compiled an AC catalogue. ACs are shown to evolve quasi-periodically, in pulses that are 15–20 rotations long. We have analyzed the North-South asymmetry in the AC location. In cycle 21, 90 % of the proton flares that affected the natural environment are shown to have occurred in ACs. We note a tendency for AC activity to decrease, as well as the manifestation of the Gnevyshev—Ohl rule in AC properties, in solar cycles 21–24.

The paper provides statistical data on solar activity complexes (ACs) observed in solar cycle 21. From the synoptic charts for the 1976–1986 sunspot activity, we have detected the regions where the sunspot generation was observed at least through three Carrington Rotations (CRs). These regions were identified as AC cores. We have compiled an AC catalogue. ACs are shown to evolve quasi-periodically, in pulses that are 15–20 rotations long. We have analyzed the North-South asymmetry in the AC location. In cycle 21, 90 % of the proton flares that affected the natural environment are shown to have occurred in ACs. We note a tendency for AC activity to decrease, as well as the manifestation of the Gnevyshev—Ohl rule in AC properties, in solar cycles 21–24.

 solar activity activity complexes flares North-South asymmetry solar activity activity complexes flares North-South asymmetry The work was carried out using the Unique Research Facility "Astrophysical complex of MSU-ISU" with financial support from the Ministry of Science and Higher Education of the Russian Federation (Agreement 13.UNU.21.0007, Government Assignment FZZE-2020-0017, FZZE-2020-0024, and Subsidy No. 075-GZ/Ts3569/278). The work was carried out using the Unique Research Facility "Astrophysical complex of MSU-ISU" with financial support from the Ministry of Science and Higher Education of the Russian Federation (Agreement 13.UNU.21.0007, Government Assignment FZZE-2020-0017, FZZE-2020-0024, and Subsidy No. 075-GZ/Ts3569/278).

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