ИСТИНА

Magnetic activity is a global property of the Sun; the complex processes of solar activity are connected with the solar magnetic fields. For solar-type stars and the Sun magnetic activity depends on the physical parameters of the star. We study the relationships between the duration of 11-year activity cycle (T11) and effective temperature for solar-type stars and the Sun. We’ve tried to explain these relationships due to the existence of layer of laminar convection near the bottom of the convective zone of the star. In this layer the Rossby waves are formed. They generate the primary poloidal magnetic field, which is the source of energy of the complex phenomena of magnetic activity. Under the assumption that the time of generation of Rossby waves tg corresponds to duration of the activity cycle Tcyc it was shown that empirical dependence T11 ~ Teff^(– 1,1) describes well the dependence between the star’s duration of the activity cycle Tcyc and their effective temperature Teff estimated by our model Tcyc~tg~Teff ^(-5/4). Thus we emphasized the significant contribution of Rossby waves in formation of magnetic cycles of stars and the Sun.