Complexes of activity on the Sun in solar cycle 21-Reference-Cited by-同舟云学术

Complexes of activity on the Sun in solar cycle 21

Published:2021-12-20 Issue:4 Volume:7 Page:3-9
ISSN:2500-0535
Container-title:Solar-Terrestrial Physics
language:en
Short-container-title:

Author:

Yazev Sergey¹²,Ulianova Maria²,Isaeva Elena²

Affiliation:

1. Institute of Solar Terrestrial Physics SB RAS

2. Irkutsk State University

Abstract

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.

Publisher

Infra-M Academic Publishing House

Subject

Space and Planetary Science,Atmospheric Science,Geophysics

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