A 127-day Periodicity in Solar Flare Occurrence

Details A 127-day Periodicity in Solar Flare Occurrence A 127-day Periodicity in Solar Flare Occurrence

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsh42a0780b&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SH42A-0780

Physics

7519 Flares, 7536 Solar Activity Cycle (2162)

Scientific paper

Epochs of high solar flare activity during the last two-year period appeared with regular intervals of 127 days. These epochs occurred in November 1999, March 2000, July 2000, late November 2000, early April 20001, and August 2001. A spectral analysis of flare occurrence times during the interval from September 1999 to early September 2001 shows a significant peak at 91.5 nHz \(126.5 days\). This 127-day periodicity was previously detected in flare occurrence times for cycle 20. This period, 51-day period, 77-day period, and 154-day period are very close to integral multiples of 25.5 days. Thus, the detection of the 127-day periodicity supports the idea that 25.5 days is a fundamental period.

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