Abstract
Various aspects of the of geoefficiency of solar-activity phenomena, such as flares and coronal mass ejections (CMEs), are considered. The number of geoefficient events was about two times lower in the 24th cycle than in the 23rd cycle. Statistical data on major flares and the Dst index in different phases of the 24th cycle is compared. Large flares (X-ray class > M5) were analyzed based on data from GOES-15 satellite observations in the 24th solar activity cycle. The three main geomagnetic indices, Ap, Kp, and Dst, were analyzed in comparison with the F10.7 index and the sunspot number (SSN).
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ACKNOWLEDGMENTS
The authors are grateful for the opportunity to use the catalog of SA data for the 23rd and 24th cycles under the guidance of Ishkov and the archives of GOES, Kr, Ap, Dst, and SOHO/LASCO CME data.
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Translated by M. Hannibal
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Bruevich, E.A., Yakunina, G.V. 24th Cycle of Solar Activity: Geoefficiency of Flares. Geomagn. Aeron. 60, 876–880 (2020). https://doi.org/10.1134/S0016793220070087
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DOI: https://doi.org/10.1134/S0016793220070087