The 17-month periodicity of sunspot activity

Details The 17-month periodicity of sunspot activity The 17-month periodicity of sunspot activity

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..112..313a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 112, no. 2, 1987, p. 313-316.

Physics

29

Periodic Variations, Solar Flares, Statistical Analysis, Sunspots, Power Spectra, Spatial Distribution

Scientific paper

The time variation of sunspot activity during the period of 1969-1986 has been described using the area and the number of sunspot groups for both hemispheres as the indices of sunspot activity. A 17-month periodicity is found, consistent with the 500-day periodicity of flare occurrence noted by Ichimoto et al. (1985). A 17-month periodicity was also found for the latter half of cycle 20 (1969-1975), although this periodicity is less pronounced than that in cycle 21.

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