Number of SPOT groups formed and their average lifetime in solar activity cycle No. 20

Details Number of SPOT groups formed and their average lifetime in solar activity cycle No. 20 Number of SPOT groups formed and their average lifetime in solar activity cycle No. 20

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35..233k&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, Aug. 1984, p. 233-240.

Astronomy and Astrophysics

Astronomy

7

Sunspot Cycle, Secular Variations, Solar Cycles, Tables (Data)

Scientific paper

Additional values are offered for the number and lifetimes of sunspot groups formed during the twentieth 11-year cycle of sunspot activity from 1965 to 1976. The values are derived from observational data collected with the Greenwich Photoheliograph. The additional values are presented in a series of tables. The data show that the average lifetime of sunspot groups during cycle 20 actually decreased in comparison with cycles 19 and 18, and that the number of groups formed in cycle 20 confirms the existence of a systematic increase in the number of sunspot groups formed over the last 100 years. It is suggested that this increase is probably associated with a solar activity variation of several hundred years.

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