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Results of analysis of long time variations of solar activities based onmonthly Wolf number series (1749-2011 years) are represented. Shown thepresence of stable oscillations in autocorrelation function for the Wolfnumbers series with a period near 42.5 years. The statistical model ofvariations of autocorrelation function based on assumption of nonstationarityprocess are constructed. The question of using the model to predict the solaractivity is discussed.

Long Time Oscillations of Wolf Number Series Autocorrelation Function and Possibility of Solar Activity Prediction