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Periodicities in solar activity

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Abstract

The techniques of power spectral analysis are used to determine significant periodicities in the annual mean relative sunspot numbers. The main conclusion is that a period of 10.45 yr is very basic and can be associated with an excitation of new solar cycles. When combined with a period of 11.8 yr, associated here with the free-running length of a solar cycle, the mean cycle length of 11.06 yr and a phase variation of 190 yr are explained. Similarly the amplitude variations with periods 88 and 59 yr (previously described as the 80-yr cycle) are due to an amplitude modulation of the solar cycle by a period of 11.9±0.3 yr. The results dispute several associations of planetary position and solar activity.

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Radiophysics Publication RPP 1647, January, 1973.

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Cole, T.W. Periodicities in solar activity. Sol Phys 30, 103–110 (1973). https://doi.org/10.1007/BF00156178

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  • DOI: https://doi.org/10.1007/BF00156178

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