The Intermediate-Term Quasi-Cycles of Wolf Number and Group Sunspot Number Fluctuations |
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Authors: | Email author" target="_blank">R?GetkoEmail author |
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Affiliation: | (1) Astronomical Institute, Wrocław University, Kopernika 11, 51-622 Wrocław, Poland |
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Abstract: | 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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