On long-term periodicities in the sunspot cycle

Details On long-term periodicities in the sunspot cycle On long-term periodicities in the sunspot cycle

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...80..379w&link_type=abstract

Solar Physics, vol. 80, Oct. 1982, p. 379-384.

Physics

10

Solar Spectra, Sunspot Cycle, Periodic Variations, Power Spectra, Spectrum Analysis

Scientific paper

We investigate the possible existence of periodicities other than that of 11 years in the mean annual sunspot number. The power spectrum for the sunspot numbers for the years 1711-1966 is compared with power spectra for the same period in which the solar cycles have been permuted randomly. Peaks in the power spectra at periodicities other than 11 years are found to appear and disappear in a random way. We conclude that the 11 year periodicity is the only statistically significant one present in the sunspot data.

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