Analysis of events during the M 2.5 flare on June 7, 2011

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Published: Mar 22, 2025
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Keywords:
chromospheric flare prominence radiation flux homogeneous layer of heated gas

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Yurii Kupryakov
Sternberg Astronomical Institute, Moscow State University, Universitetsky pr. 13, Moscow 119234, Russia; Astronomical Institute of the Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic
Victor Maliutin
Sternberg Astronomical Institute, Moscow State University, Universitetsky pr. 13, Moscow 119234, Russia
Konstantin Bychkov
Sternberg Astronomical Institute, Moscow State University, Universitetsky pr. 13, Moscow 119234, Russia
Oksana Belova
Sternberg Astronomical Institute, Moscow State University, Universitetsky pr. 13, Moscow 119234, Russia
Aleksei Gorshkov
Sternberg Astronomical Institute, Moscow State University, Universitetsky pr. 13, Moscow 119234, Russia

Abstract

The object under study is the fragments of the falling matter during the M 2.5 flare in the NOAA AR 11226 on June 7, 2011. Observations were carried out with the horizontal solar installation HSFA-2 and the multichannel flare spectrograph MFS (Ondrejov Observatory). The traces of fragments were found in the CaII H, Hα, and Hβ lines. After reducing the line spectra, absorption fluxes were calculated for four moments of time, and a system of equations was solved for the populations of discrete levels and the ionization state of the hydrogen atom and CaII ion. The source of radiation was considered in the approximation of a homogeneous layer of heated gas. The gas parameters were selected in such a way that the observed and theoretical fluxes coincide with an accuracy of better than 5%. Calculations have shown that the temperature range T varies from 7 to 12 thousand K, the column concentration N is 1–5 1019 cm-2, and the turbulent speed varies from 6 to 21 km/s.

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How to Cite
Kupryakov Y., Maliutin V., Bychkov K., et al., 2025. Acta Astrophysica Taurica, vol. 6, no. 1, pp. 1–4. Available at: https://astrophysicatauricum.org/index.php/aat/article/view/103 (Accessed: 18 April 2025)
Issue
Vol. 6 No. 1 (2025)
Section
Research articles
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