Long-term variations in duration of solar cycles

Details Long-term variations in duration of solar cycles Long-term variations in duration of solar cycles

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42...90c&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, no. 2, April 1991, p. 90-97.

Astronomy and Astrophysics

Astronomy

4

Solar Cycles, Sunspot Cycle, Long Term Effects, Secular Variations

Scientific paper

Using smoothed annual values of the Wolf sunspot numbers, duration of the individual solar cycles to the last five centuries were calculated. It was found that periods of short cycles (10 - 10.5 years) and long cycles (11.5 - 12 years) reoccur alternately with a recurrence period of about 180 years. At the same time, maximum solar activity in periods of the short cycles is higher than in periods of the long cycles. The prevailing periods of cycles, as well as long-term periodicities of variations in cycle durations are illustrated in the spectra of selected intervals of 40, 60 and 80 years. These long-term periodicities are also demonstrated on sonagrams.

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