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Analysis of the Preflare Phase of Eruptive and Noneruptive Flares Using Data on the Spatial Dynamics of Coronal Magnetic Structures and Their Microwave and Ultraviolet Emission

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Abstract—

The dynamics of the preflare phase of microwave and ultraviolet emission for M-class X-ray flares in three active regions (ARs), two flares with coronal mass ejections (CMEs) and one flare without a CME, were considered. Extrapolation of the magnetic field in the AR corona showed that eruptive events were associated with the formation of a twisted magnetic field (magnetic flux rope) and with an open magnetic configuration at the flare site in two ARs with CMEs under consideration, while the flare without a CME was observed in a closed magnetic configuration.

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ACKNOWLEDGMENTS

The work was performed using data from the Nobeyama Radioheliograph, which was operated by the International Consortium for the Continued Operation of Nobeyama Radioheliograph (ICCON). ICCON includes the ISEE/Nagoya University, NAOC, KASI, NICT, and GSFC/NASA. We are grateful to the SDO team for the AIA and HMI observational data. The flare catalog is available at NOAA, Space Weather Prediction Center at ftp://ftp.ngdc.noaa.gov/ STP/swpc_products/weekly_reports/PRFs_of_SGD/. Programs for nonlinear force-free extrapolation of the magnetic field into the solar corona were developed by S.A. Anfinogentov and A.G. Stupishin and are available at https://github.com/Sergey-Anfinogentov/GXBox_prep, https://github.com/Alexey-Stupishin/Magnetic-Field_ Library.

Funding

This work was supported by the Russian Foundation for Basic Research–Czech Republic, project no. 20-52-26 006 (A.V. Shain), Russian Science Foundation, project no. 22-12-00308 (V.F. Melnikov), and State Task, project no. 1021032422589-5 (V. E. Abramov-Maхimov).

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Authors and Affiliations

  1. HSE University, Nizhny Novgorod, Russia

    I. A. Bakunina

  2. Pulkovo Observatory, 196140, St. Petersburg, Russia

    V. F. Melnikov, A. V. Shain & V. E. Abramov-Maximov

Authors
  1. I. A. Bakunina
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  2. V. F. Melnikov
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  3. A. V. Shain
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  4. V. E. Abramov-Maximov
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Correspondence to I. A. Bakunina.

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Translated by O. Pismenov

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Bakunina, I.A., Melnikov, V.F., Shain, A.V. et al. Analysis of the Preflare Phase of Eruptive and Noneruptive Flares Using Data on the Spatial Dynamics of Coronal Magnetic Structures and Their Microwave and Ultraviolet Emission. Geomagn. Aeron. 62, 1066–1072 (2022). https://doi.org/10.1134/S0016793222080047

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