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The application of the Wavelet analysis and Fourier analysis to the datasetof variations of radiation fluxes of solar-like stars and the Sun is examined.In case of the Sun the wavelet-analysis helped us to see a set of values ofperiods of cycles besides "11-year" cycle: the long-duration cycles of 22-year,40-50 year and 100-120 year and short-duration cycles of 2-3,5 years and1,3-year. We present a method of the chromospheric flux simulation using the 13late-type stars, which have well-determined cyclic flux variations similar tothe 11-year solar activity cycle. Our flux prediction is based on thechromospheric calcium emission time series measurements from the Mount WilsonObservatory and comparable solar dataset. We show that solar three - componentmodeling well explains the stellar chromospheric observations.

Cycles of the magnetic activity of the Sun and solar-type stars and simulation of their fluxes