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Solar-Flare Precursors in the Microwave Range

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Abstract

A study of quasi-periodic fluctuations of solar microwave emission at the preflare stage is presented. Data from daily solar observations by the Nobeyama Radioheliograph at a frequency of 17 GHz are used. Five flares are analyzed based on synthesized two-dimensional radio images. All of the considered events are characterized by preflare fluctuations of microwave emission with periods of one to several tens of minutes. The length of preflare trains is five pulses on average. Also, 129 flares are analyzed from correlation plots. Seventy-five percent of the events have preflare fluctuations of microwave emission with lengths of 2–3 to 60–70 min. Various fluctuation periods have been observed: from several seconds to several minutes. The effect can be caused by an increase in the amplitude of magnetohydrodynamic (MHD) waves propagating in the active region before the onset of a solar flare.

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ACKNOWLEDGMENTS

This study was performed with the use of data from the Nobeyama Radioheliograph, which is operated by the International Consortium for the Continued Operation of Nobeyama Radioheliograph (ICCON). ICCON consists of the Institute for Space–Earth Environmental Research of Nagoya University, National Astronomical Observatories of China, Korea Astronomy and Space Science Institute, National Institute of Information and Communications Technology, and the Goddard Space Flight Center of the National Aeronautics and Space Administration. The NoRH correlation data can be accessed at ftp://solar.nro.nao.ac.jp/pub/nsro/norh/data/. The software for wavelet analysis was developed by C. Torrence and G. Compo and can be accessed at http:// paos.colorado.edu/research/wavelets/. The SWPC PRF sare available from ftp://ftp.ngdc.noaa.gov/STP/swpc_ products/weekly_reports/PRFs_of_SGD/.

Funding

This study was performed within state target 0041-2019-0019 (“Energy Release”) and supported partially by a program of the Presidium of the Russian Academy of Sciences.

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Authors and Affiliations

  1. Central Astronomical Observatory at Pulkovo, Russian Academy of Sciences, St. Petersburg, Russia

    V. E. Abramov-Maximov

  2. National Research University Higher School of Economics, Nizhny Novgorod, Russia

    I. A. Bakunina

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  1. V. E. Abramov-Maximov
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  2. I. A. Bakunina
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Correspondence to V. E. Abramov-Maximov.

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Translated by V. Arutyunyan

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Abramov-Maximov, V.E., Bakunina, I.A. Solar-Flare Precursors in the Microwave Range. Geomagn. Aeron. 60, 846–852 (2020). https://doi.org/10.1134/S0016793220070038

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