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Solar Physics

, Volume 30, Issue 1, pp 103–110 | Cite as

Periodicities in solar activity

  • T. W. Cole
Article

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.

Keywords

Spectral Analysis Solar Activity Solar Cycle Amplitude Modulation Cycle Length 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1973

Authors and Affiliations

  • T. W. Cole
    • 1
  1. 1.Division of RadiophysicsCSIROSydneyAustralia

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