Nanoflash Distribution at the Solar Minimum

S. A. Bogachev; Богачёв С. А.

doi:10.31857/S0016794023600230

Nanoflash Distribution at the Solar Minimum

Authors: Bogachev S.A.¹
Affiliations:
1. Space Research Institute, Russian Academy of Sciences (IKI RAS)
Issue: Vol 63, No 4 (2023)
Pages: 488-495
Section: Articles
URL: https://journals.rcsi.science/0016-7940/article/view/134739
DOI: https://doi.org/10.31857/S0016794023600230
EDN: https://elibrary.ru/OJWAJX
ID: 134739

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Abstract

We use data from the Atmospheric Imaging Assembly (AIA) telescope on the Solar Dynamics
Observatory (SDO) spacecraft in the 171 Å channel to investigate the spatial distribution of low-energy
flares (nanoflashes). We have studied two periods: 05/20/2019 from 1200 UT to 1300 UT and 05/10/2020
from 1200 UT to 1300 UT. In total, we found 87974 nanoflares with an average formation rate of 6.0 ×
10‒21 cm–2 s–1. For solar latitudes from 0° up to 50° the nanoflare formation rate is approximately uniform
with a standard deviation of about 25%. We have found an asymmetry in the rate of formation of nanoflares
in the southern and northern hemispheres of the Sun: the rate of formation of nanoflares in the southern
hemisphere was 34–42% higher than in the northern one. During this period, the same asymmetry was
also observed for ordinary f lares. We also found a weak dependence of the nanof lare formation rate on the
solar cycle: the number of nanof lares increases with higher solar activity.

About the authors

S. A. Bogachev

Space Research Institute, Russian Academy of Sciences (IKI RAS)

Author for correspondence.
Email: bogachev.sergey@gmail.com
Moscow, 117997 Russia

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