Open AccessComplexes of activity on the Sun in solar cycle 21
Author(s) -
S. Yazev,
Maria Ulianova,
E. S. Isaeva
Publication year - 2021
Publication title -
solar-terrestrial physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.11
H-Index - 2
ISSN - 2500-0535
DOI - 10.12737/stp-74202101
Subject(s) - sunspot , solar cycle 23 , solar cycle , solar cycle 24 , physics , solar flare , solar cycle 22 , atmospheric sciences , meteorology , astrophysics , environmental science , plasma , nuclear physics , solar wind , magnetic field , quantum mechanics
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.