Features of the solar active cycles.

Details Features of the solar active cycles. Features of the solar active cycles.

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pyuno....s.446l&link_type=abstract

Publications of the Yunnan Observatory, Suppl. 1999, p. 446 - 450

Physics

Solar Activity Cycles: Periods, Solar Activity Cycles: Sunspot Numbers

Scientific paper

Characteristics of the sunspot cycle described by the international sunspot numbers are investigated based on the results obtained by Hathaway, Wilson, and Reichmann (1994). A long period of about 90 years is found to possibly exist for the sunspot number time series. Cycles that take less time to rise from minimum to maximum of cycle amplitude tend to have large amplitude, and those that have small maximum amplitude tend to run a long time to get ended. It is also found that the more recent cycles are larger in amplitude and shorter both in cycle length and the rising time of solar cycle than the earlier ones.

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