Revisit to the Sunspot Cycles

Details Revisit to the Sunspot Cycles Revisit to the Sunspot Cycles

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jkas...24..117k&link_type=abstract

Journal of the Korean Astronomical Society, vol. 24, no. 1, p. 117-127

Astronomy and Astrophysics

Astronomy

Scientific paper

Here I report the confirmation of a long-term modulation of a period of 92 ^+21 _-13 years with the "time-delay correlation" method on the sunspot data compiled over the last a total 289 years. This periodically better specifies the cycle which falls pretty well within Gleissberg cycle, and clearly contrasts with the 55 year grand cycle which Yoshimura (1979) claimed. It is argued that the period-amplitude diagram method, which Yoshimura used, analysed peak amplitudes only so that a large number of data were disregarded, and thus was more susceptible to a bias. The Planetary tidal force on Sun as for the possible cause to the solar activity was investigated and its possibility was ruled out in view of no period correlation between them.

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