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The fine structure of the solar activity index W (Wolf numbers) is investigated. It is suggested that the quasi-biennial oscillations are the main features of the 11-year cycles. The attempt to simulate them by analytical functions is presented. The spectral properties of the whole W values time series are discussed. A conception of the Sun as a magnetic variable star is suggested. A prognosis of the solar cycles 23-24 are given.
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Keywords: 11-year cycle; Quasi-biennial oscillations; Solar activity; Solar cycles forecasting

Document Type: Research Article

Affiliations: 1: Sternberg Astronomical Institute (SAI), Moscow State University, 119899, Moscow, Russia 2: Skobeltsyn Institute of Nuclear Physics, Moscow State University, 119899, Moscow, Russia

Publication date: 2002-01-01

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