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Nanoflash Distribution at the Solar Minimum
- Authors: Bogachev S.A.1
-
Affiliations:
- Space Research Institute, Russian Academy of Sciences (IKI RAS)
- Issue: Vol 63, No 4 (2023)
- Pages: 488-495
- Section: Articles
- URL: https://permmedjournal.ru/0016-7940/article/view/651002
- DOI: https://doi.org/10.31857/S0016794023600230
- EDN: https://elibrary.ru/OJWAJX
- ID: 651002
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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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