Abstract
On the basis of analysis of the occurrence rate of major flares (X-ray class ≥M3.0), we present evidence that the 51-day periodicity was in operation during the interval from May 4, 1991 to November 15, 1992. This periodicity is noted to be two times 25.5 days, which has been proposed as the fundamental period of the Sun.
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Bai, T. The 51-day periodicity in cycle 22. Sol Phys 150, 385–388 (1994). https://doi.org/10.1007/BF00712899
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DOI: https://doi.org/10.1007/BF00712899