Did sunspot maximum occur in 1989?

Details Did sunspot maximum occur in 1989? Did sunspot maximum occur in 1989?

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991s%26t....81...21m&link_type=abstract

Sky and Telescope (ISSN 0037-6604), vol. 81, Jan. 1991, p. 21-23.

Astronomy and Astrophysics

Astronomy

3

Solar Activity, Sunspot Cycle, Annual Variations, Prediction Analysis Techniques

Scientific paper

Although astronomers expected the current solar cycle (Cycle 22) to peak in 1990 or 1991, the fact that the number of sunspots observed dropped from a high monthly mean of 196 in June 1989 to a low of 105 in June 1990 gave rise to arguments that the peak of the Cycle 22 may have occurred in June 1989. In this paper, after emphazing the difficulties of correctly estimating the exact time of a sunspot maximum, the time patterns of Cycle 18 sunspot and solar radio flux values are compared with the trends seen so far in the Cycle 22, showing the presence of similarities between the trends in the two sunspot cycles and an evidence of a possibility for the occurrence of the true Cycle 22 maximum in late 1990.

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