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Oscillations of the Microwave Emission of Solar Active Region 12673 before Flares

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Abstract

We present a study of quasi-periodic pulsations in the microwave emission from solar active region (AR) NOAA 12673, which produced the strongest flares of the 24th solar activity cycle. The data from daily observations of the Sun at the Nobeyama Radioheliograph at a frequency of 17 GHz were used. The microwave emission of the AR was analyzed for September 3–4, 2017, i.e., before the first M-class flare, which occurred on September 4. Long-period pulsations in the microwave emission with periods of approximately 100 min appeared at least 7 h before the first M-class flare, which was followed by strong flare activity in NOAA 12673. The effect is similar to the previously discovered preflare oscillatory phenomena with different periods manifested in different ranges.

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ACKNOWLEDGMENTS

The study used data from the Nobeyama Radioheliograph, the observations at which are carried out with the support of the International Consortium for the Continued Operation of Nobeyama Radioheliograph, ICCON). ICCON consists of ISEE/Nagoya University, NAOC, KASI, NICT, and GSFC/NASA. The wavelet analysis software was developed by C. Torrence and G. Compo and is available at http://paos.colorado.edu/research/wavelets/. The SWPC PRF data are available at ftp://ftp.ngdc.noaa.gov/STP/ swpc_products/weekly_reports/PRFs_of_SGD/2017/09/. The authors would like to thank I.V. Zimovets for helpful comments.

Funding

The study was performed as part of the State Assignment (subject 0041-2019-0019) with partial support from the RAS Program of basic research 12 “Problems of Origin and Evolution of the Universe.”

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Authors and Affiliations

  1. Central (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, 196140, St. Petersburg, Russia

    V. E. Abramov-Maximov

  2. Higher School of Economics National Research University, 603093, Nizhny Novgorod, Russia

    I. A. Bakunina

Authors
  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 M. Chubarova

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Abramov-Maximov, V.E., Bakunina, I.A. Oscillations of the Microwave Emission of Solar Active Region 12673 before Flares. Geomagn. Aeron. 59, 822–826 (2019). https://doi.org/10.1134/S001679321907003X

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  • DOI: https://doi.org/10.1134/S001679321907003X

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