Rhythm of physical sunspot cycles |
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| Authors: | E M Roshchina A P Sarychev |
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| Institution: | 1.Sternberg Astronomical Institute,Moscow State University,Moscow,Russia |
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| Abstract: | The time series of the relative sunspot number is interpreted as a sequence of physical cycles of sunspot activity overlapping
in the minimum. The cycle periodicity, i.e., the time interval between neighboring cycles, can be considered as a quantitative
characteristic of the sequence. Estimates of this interval have been obtained for 11 and 22-year cycles. In the growth phase
and in the century cycle maximum, the 22-year cycles follow one another with an interval of 21 ± 0.4 years, and in the decline
phase, 23 ± 0.3 years. This division of intervals into two groups depending on the century cycle phase should be taken into
consideration when developing a theory of solar activity cycles. |
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