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Increased Microwave Radiation Brightness as a Sign of Flare-Producing Active Regions Based on Observations of NOAA Active Region 12371

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Abstract

Methods to predict solar flares based on observations in the microwave range with radio telescopes with high angular resolution continue to be developed. The results are presented for an analysis of observations of NOAA active region 12371, in a quasi-quiescent state characterized by increased brightness of emission in the microwave range, which causes multiple eruptive events. According to observations with the RATAN-600 radio telescope during the event of June 21, 2015, a sharp change in the structure of the image of the microwave radiation source above NOAA region 12 371 was recorded. It was presumably interpreted by short-term plasma heating over the region of the delta configuration of the magnetic field in the tail part of the active region. Due to the high sensitivity of RATAN-600 during polarization measurements, it is possible to localize the position of the cloud in which the emission or acceleration of fast particles occurs with known models of the magnetic field.

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7. ACKNOWLEDGMENTS

We express our deepest respect and gratitude to the entire team of the RATAN-600 radio telescope and the Nobeyama Radioheliograph scientific consortium, which ensure the long-term operation of these instruments and make their data freely available.

Funding

The work was carried out within the framework of the state assignment of the Special Astrophysical Observatory of the Russian Academy of Sciences and approved by the Ministry of Science and Higher Education of the Russian Federation on the topic “Studies of the dynamic characteristics of active formations in the solar atmosphere in a wide wavelength range,” registration number: 0037-2021-0010.

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Authors and Affiliations

  1. Special Astrophysical Observatory, St. Petersburg branch, Russian Academy of Sciences, St. Petersburg, Russia

    N. G. Peterova & E. A. Kurochkin

  2. St. Petersburg State University, St. Petersburg, Russia

    N. A. Topchilo

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  1. N. G. Peterova
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  2. N. A. Topchilo
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  3. E. A. Kurochkin
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Correspondence to N. G. Peterova, N. A. Topchilo or E. A. Kurochkin.

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Translated by E. G. Morozov

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Peterova, N.G., Topchilo, N.A. & Kurochkin, E.A. Increased Microwave Radiation Brightness as a Sign of Flare-Producing Active Regions Based on Observations of NOAA Active Region 12371. Geomagn. Aeron. 61 (Suppl 1), S24–S35 (2021). https://doi.org/10.1134/S0016793222010145

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