The Intermediate-Term Quasi-Cycles of Wolf Number and Group Sunspot Number Fluctuations

Details The Intermediate-Term Quasi-Cycles of Wolf Number and Group Sunspot Number Fluctuations The Intermediate-Term Quasi-Cycles of Wolf Number and Group Sunspot Number Fluctuations

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006soph..238..187g&link_type=abstract

Solar Physics, Volume 238, Issue 1, pp.187-206

Physics

4

Scientific paper

I apply spectral and auto-correlation analyses to the monthly Wolf number fluctuations for 22 solar cycles and to the group sunspot number fluctuations for 18 solar cycles and find the existence of an 11-month quasi-periodicity in these data. Its strength correlates very well (ρ ? 0.8) with the variance of fluctuations. Moreover, for both Wolf and group sunspot indexes I divide a stationary version of fluctuation time series into two parts: those from periods of low and high solar activity. I find statistically significant quasi-periodicity (9 months) in both high- and low-activity data sets. I also find the quasi-period of about 15 months in the time series of high-activity periods.

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