The 77 day periodicity in the flare rate of cycle 22

Details The 77 day periodicity in the flare rate of cycle 22 The 77 day periodicity in the flare rate of cycle 22

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...388l..69b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 388, April 1, 1992, p. L69-L72.

Astronomy and Astrophysics

Astronomy

44

Monte Carlo Method, Power Spectra, Solar Flares, Sunspots, Goes Satellites, Periodic Variations, X Ray Astronomy

Scientific paper

The ocurrence times of major flares of solar cycle 22 are analyzed to detect periodicities. It is found that a periodicity of 77 d was in operation in the 15-m interval from 1988 November to 1990 February for six cycles. During the rest of 1990 no periodicity was discernible; however, it seems that the 77-d periodicity resumed in 1991. This 77-d period is interpreted as the third subharmonic of the fundamental period of about 25.5 d. In this interpretation, the 154-d periodicity is the sixth subharmonic. It is also found that when the 77-d periodicity or the 154-d periodicity is in operation the occurrence rate of major flares is much higher than is expected form the relative sunspot number.

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