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The Frequency of Occurrence of Pre-Flare Fluctuations in Microwave Radiation of Active Regions

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Abstract

We present a study of the frequency of occurrence of quasi-periodic fluctuations (QPFs) of microwave radiation from solar active regions at the pre-flare stage. We used correlation curves obtained with the Nobeyama Radioheliograph (NoRH). We analyzed 529 flares of classes X, M, and C (according to the GOES classification). In a significant number of considered events (approximately 75% of the powerful flares and 50% of the weaker flares), preflare fluctuations of microwave radiation with a duration of up to ten pulses are observed. The character of preflare fluctuations is different in different cases. In some cases, almost harmonic oscillations are observed. In most cases, the fluctuations are sporadic and look like a sequence of weak flares. It is possible that the nature of the preflare QPFs is different in different cases.

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REFERENCES

  1. Abramov-Maximov, V.E. and Bakunina, I.A., Features of short-period oscillations of microwave emission from the solar active region before the flare, Phys. At. Nucl., 2018, vol. 81, no. 3, pp. 379–383.

    Article  Google Scholar 

  2. Abramov-Maximov, V.E. and Bakunina, I.A., Oscillations of the microwave emission of solar active region 12673 before flares, Geomagn. Aeron. (Engl. Transl.), 2019, vol. 59, no. 7, pp. 822–826.

  3. Abramov-Maximov, V.E. and Bakunina, I.A., Solar-flare precursors in the microwave range, Geomagn. Aeron. (Engl. Transl.), 2020, vol. 60, no. 7, pp. 846–852.

  4. Abramov-Maximov, V.E., Gelfreikh, G.B., and Shibasaki, K., Quasi-periodic oscillations of solar active regions in connection with their flare activity: NoRH observations, Sol. Phys., 2011, vol. 273, pp. 403–412.

    Article  Google Scholar 

  5. Aleshin, V.I., Kobrin, M.M., and Korshunov, A.I., Quasiperiodic components with periods of from 30 to 60 min in the fluctuation spectra of solar radio emission at the 3 cm wavelength, Radiophys. Quantum Electron., 1973, vol. 16, no. 5, pp. 571–576.

    Article  Google Scholar 

  6. Arbuzov, S.I., Flare-associated variations in the spectral slope of radio emission (λ ≈ 3 cm) from solar active regions, Radiophys. Quantum Electron., 1980, vol. 22, no. 10, pp. 803–811.

    Article  Google Scholar 

  7. Avdyushin, S.I., Bogomolov, A.F., Borisova, E.A., et al., Relationship between solar activity and the radio-emission characteristics of solar active regions, Dokl. Akad. Nauk SSSR, 1985, vol. 283, no. 1, pp. 67–70.

    Google Scholar 

  8. Aver’yanikhina, E., Paupere, M., Ozólinš, G., and Eliass, M., On the character of amplitude change of intensity fluctuations of solar radio radiation in the decimeter band before powerful radio bursts which are connected with flares, Issled. Solntsa Krasnykh Zvezd, 1982, no. 16, pp. 61–74.

  9. Berulis, I.I., Molchanov, A.P., Olyanyuk, V.P., et al., The spectral index and fluctuations of solar radio emission at the λ≈3 cm wavelength, Radiophys. Quantum Electron., 1973, vol. 16, no. 9, pp. 1047–1049.

    Article  Google Scholar 

  10. Berulis, I.I., Kozlovskii, A.L., Losovskii, B.Y., et al., Fluctuations of the radio emission of local sources on the sun based on observations on the RT-22 radio telescope of the Lebedev institute, Sov. Astron., 1983, vol. 27, no. 5, pp. 563–567.

    Google Scholar 

  11. Bystrov, M.V., Kobrin, M.M., and Snegirev, S.D., Pulsations of the geomagnetic field prior to solar proton flares, Sov. Astron. Lett., 1978, vol. 4, pp. 76–77.

    Google Scholar 

  12. Bystrov, M.V., Kobrin, M.M., and Snegirev, S.D., Quasi-periodic pulsations of the Earth’s magnetic field with periods of 20–200 min and their connection with analogous pulsations in the solar radio emission before proton bursts, Geomagn. Aeron., 1979, vol. 19, pp. 197–199.

    Google Scholar 

  13. Durasova, M.S., Kobrin, M.M., and Yudin, O.I., Evidence of quasi-periodic movements in the solar chromosphere and corona, Nature, 1971, vol. 229, no. 3, pp. 82–84.

    Google Scholar 

  14. Gelfreikh, G.B., Grechnev, V.V., Kosugi, T., and Shibasaki, K., Detection of periodic oscillations in sunspot-associated radio sources, Sol. Phys., 1999, vol. 185, pp. 177–191.

    Article  Google Scholar 

  15. Gelfreikh, G.B., Nagovitsyn, Yu.A., and Nagovitsyna, E.Yu., Quasi-periodic oscillations of microwave emission in solar active regions, Publ. Astron. Soc. Jpn., 2006, vol. 58, pp. 29–35.

    Article  Google Scholar 

  16. Kobrin, M.M., Pakhomov, V.V., Durasova, M.S., et al., Fluctuations of solar radio emission at the 3-cm wavelength using two radio telescopes that are spaced 1500 km apart, Radiophys. Quantum Electron., 1973, vol. 16, no. 9, pp. 1036–1039.

    Article  Google Scholar 

  17. Nakajima, H., Nishio, M., Enome, S., et al., The Nobeyama radioheliograph, Proc. IEEE, 1994, vol. 82, pp. 705–713.

    Article  Google Scholar 

  18. Shibasaki, K., Microwave detection of umbral oscillation in NOAA active region 8156: Diagnostics of temperature minimum in sunspot, Astrophys. J., 2001, vol. 550, pp. 1113–1118.

    Article  Google Scholar 

  19. Sych, R., Nakariakov, V.M., Karlicky, M., and Anfinogentov, S., Relationship between wave processes in sunspots and quasi-periodic pulsations in active region flares, Astron. Astrophys., 2009, vol. 505, pp. 791–799.

    Article  Google Scholar 

  20. Tan, B., Yu, Z., Huang, J., Tan, C., and Zhang, Y., Very long-period pulsations before the onset of solar flares, Astrophys. J., 2016, vol. 833, p. 206.

    Article  Google Scholar 

  21. Zhdanov, A.A. and Charikov, Y.E., Power-spectrum analysis of preflare solar X rays, Sov. Astron. Lett., 1985, vol. 11, pp. 88–90.

    Google Scholar 

  22. Zimovets, I.V., Nechaeva, A.B., Sharykin, I.N., and Nizamov, B.A., Sources of long-period X-ray pulsations before the onset of solar flares, Geomagn. Aeron. (Engl. Transl.), 2022, vol. 62, no. 4, pp. 356–374.

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ACKNOWLEDGMENTS

The work was performed using data from the Nobeyama Radioheliograph, the observations on which were 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 authors are grateful to the anonymous referee for useful advice and comments.

Funding

The work was carried out within the framework of the State Assignment (No. 1021032422589-5, Multiwave active Sun,—Study of solar activity, cyclicity, solar-terrestrial relations and solar-stellar analogies on various time scales based on multiwave observations).

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Authors and Affiliations

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

    V. E. Abramov-Maximov

  2. HSE University, 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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Abramov-Maximov, V.E., Bakunina, I.A. The Frequency of Occurrence of Pre-Flare Fluctuations in Microwave Radiation of Active Regions. Geomagn. Aeron. 63, 916–919 (2023). https://doi.org/10.1134/S0016793223070022

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  • DOI: https://doi.org/10.1134/S0016793223070022

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