The 80-year cycle of sunspots

Details The 80-year cycle of sunspots The 80-year cycle of sunspots

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978lastr..92..369k&link_type=abstract

L'Astronomie, vol. 92, Sept. 1978, p. 369-371. In French.

Physics

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

Scientific paper

Solar activity is represented as the product of the total number of sunspot groups appearing during n days times their average lifetime. Examination of these parameters for all the cycles between 1874 and 1964 suggests that the average lifetime varies in an 80-year cycle. The total number of sunspot groups does not show this periodicity during the 80-year cycle but does vary over the 11-year cycle, while the lifetime remains fairly constant during the 11-year cycle. The total number increases over the period studied, and it is suggested that another solar activity cycle with a period of several hundred years might be responsible for this increase.

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