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This paper considers a possibility of magnetic-field generation by localturbulent flows at the bottom of convective zone. The cycle of magnetic-fieldgeneration in this model can be represented in the form of sequency ofprocesses. There are vortexes with azimuth axis, similar with Taylor vortex,close to the bottom of convection zone. This leads to the generation of twistedflux tubes because of screw dynamo. The growth of magnetic field causesemersion of U- loops. During the process of emersion and extraction azimuthalfield of flux tubes converts to axial field, and reaches the surface as bipolarof sunspots with U-shaped configuration. Due to differential rotation residualbipolar fields stretch out to the surface toroidal field and are shifted to thebottom of the convective zone by means of meridional flow at high latitudes.The direction of the toroidal field within the generation zone reverses itssign, and the cycle is repeated.

The Model of Magnetic-Field Generation with Screw Dynamo