Long term periodicities in the sunspot cycle

Details Long term periodicities in the sunspot cycle Long term periodicities in the sunspot cycle

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.250..398c&link_type=abstract

Nature, Volume 250, Issue 5465, pp. 398-400 (1974).

Computer Science

36

Scientific paper

THE existence of a long period undulation (~179 yr) in the solar cycle (Fig. 1, based on data from Waldmeier1,2 is suggested by the planetary theory of sunspots. Jose3, for example, postulated an association between the 178.8-yr periodicity in orbital positions of the planets and the phase of the solar cycle. Wood4 used the presumed existence of a cycle of 170-180 yr in solar activity to predict the peak dates of future sunspot cycles. Our work indicates that although a 179-yr periodicity does exist in the sunspot cycle, it is not caused by a primary long term excitation function but is, instead, a beat phenomenon. This can be seen by computing the spectrum for the data shown in Fig. 1.

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