Double cycle of solar activity in a two-layer medium

It is commonly accepted that the magnetic field of the Sun and other stars is generated through the operation of the dynamo mechanism which is based on taking into account the joint action of the α effect and differential rotation. Based on such scheme, a dynamic system was constructed in the case of a star dynamo in a two-layer medium with allowance for meridional fluxes and layer thickness for simulating the double cycle corresponding to the simultaneous presence of 22-year and quasi-biennial oscillations of the magnetic field. It is shown how the layer thickness has an effect on the threshold value of the dynamo number necessary for generating the oscillating magnetic field. At ranges of dynamo numbers that are equal to the solar ones, as the thicknesses of the inner and outer layers are equal to 1/6 of the solar radius, there exists a region of meridional circulation values when there appears a double cycle at a meridional circulation, which is equal in the absolute value in both the layers and has opposite directions in these layers.