When did the latest minimum of the 80-year sunspot period occur?

Details When did the latest minimum of the 80-year sunspot period occur? When did the latest minimum of the 80-year sunspot period occur?

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42..158k&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, no. 3, June 1991, p. 158-160.

Astronomy and Astrophysics

Astronomy

3

Solar Activity, Sunspot Cycle, Astronomical Catalogs, Interpolation, Secular Variations

Scientific paper

The pattern of the average mightiness of large sunspot groups, determined from Greenwich and Pulkovo catalogues of large sunspot groups, indicates that the minimum of the 80-year period of sunspot groups occurred in 11-year cycle no. 20, and that 11-year cycles no. 21 and 22 are already on the ascending branch of the 80-year period. The significance of this fact for prognosticating the height of the maxima in the future 11-year cycles is discussed.

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