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Characteristic Features of Solar Cosmic Rays in the 21st–24th Solar-Activity Cycles According to Data from Catalogs of Solar Proton Events

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Abstract

Homogeneous series of solar cosmic-ray events for four solar-activity cycles against the background of decreased activity in cycles 23 and 24 are considered. The number of solar cosmic-ray events with energies above 10 MeV decreased insignificantly, while the number of ground-level enhancements in comparison between cycles 23 and 24 decreased by eight times. It is shown that the average contribution of flares to the generation of ground-level enhancements decreased from cycle 23 to cycle 24 by three times, and the average contribution of coronal mass ejections decreased by five times; the average contribution of flares to the generation of solar cosmic rays with energy >10 MeV decreased by 1.3 times, and the average contribution of coronal mass ejections increased by 1.4 times.

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ACKNOWLEDGMENTS

We would like to thank all researchers who have submitted their data on solar activity and parameters of the interplanetary medium via the Internet: Rz, (http://www.sidc.be/ silso/datafiles); flares, (https://www.ngdc.noaa.gov/stp/ space-weather/solar-data/solar-features/solar-flares/x-rays/ goes/xrs/); CME, (https://cdaw.gsfc.nasa.gov/CME_ list/). References to numerous sources of SCRs were given earlier (Logachev et al., 2016). G.A. Bazilevskaya is grateful for the discussions within the project “High EneRgy sOlar partICle events analysis (HEROIC)” of the International Space Science Institute (ISSI) under the leadership of Dr. A. Papaioanou.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 19-02-00264.

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia

    G. A. Bazilevskaya

  2. Skobeltsyn Institute of Nuclear Physics, Moscow State University, Moscow, Russia

    E. I. Daibog, Yu. I. Logachev, N. A. Vlasova, L. L. Lazutin, M. D. Nguyen, G. M. Surova & O. S. Yakovchouk

  3. Fedorov Institute of Applied Geophysics, Roshydromet, Moscow, Russia

    E. A. Ginzburg

  4. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Moscow, Troitsk, Russia

    V. N. Ishkov

  5. Geophysical Center, Russian Academy of Sciences, Moscow, Russia

    V. N. Ishkov

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  1. G. A. Bazilevskaya
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  2. E. I. Daibog
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  3. Yu. I. Logachev
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  4. N. A. Vlasova
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  6. V. N. Ishkov
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  7. L. L. Lazutin
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  10. O. S. Yakovchouk
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Correspondence to G. A. Bazilevskaya.

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Bazilevskaya, G.A., Daibog, E.I., Logachev, Y.I. et al. Characteristic Features of Solar Cosmic Rays in the 21st–24th Solar-Activity Cycles According to Data from Catalogs of Solar Proton Events. Geomagn. Aeron. 61, 6–13 (2021). https://doi.org/10.1134/S0016793221010023

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