Intermediate-term periodicities in solar activity

Details Intermediate-term periodicities in solar activity Intermediate-term periodicities in solar activity

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..137..141o&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 137, Jan. 1992, p. 141-153.

Physics

21

Periodic Variations, Solar Activity, Sunspots, Power Spectra, Solar Cycles, Solar Rotation

Scientific paper

Intermediate-term periodicities in solar activity, at approximately 323 and 540 days, have been searched for in the horizontal records of two main indices of solar activity, namely, the daily sunspot areas (cycles 12-21) and the daily Zuerich sunspot number (cycles 6-21). Two different methods to compute power spectra have been used, one of them being especially appropriate to deal with gapped time series. The results obtained for the periodicity near 323 days indicate that it has only been present in cycle 21. On the other hand, a significant periodicity at 350 days is found in sunspot areas and Zuerich sunspot number during cycles 12-21 considered all together, also having been detected in some individual cycles. The periodicity around 540 days is found in cycles 12, 14, and 17 in sunspot areas, while during cycles 18 and 19 it is present, with a very high significance, in sunspot areas and Zuerich sunspot number. It also appears at 528 days in sunspot areas during cycles 12-21.

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