the field which lies in meridional planes) is not well understood. @P55 suggested that convective vorticies acting on the rising parts of large-scale toroidal magnetic field produce a ensemble of the small-scale helical magnetic loops with a North-South field component. Thus, the large-scale toroidal field is partially transformed into the poloidal magnetic field. It is the so-called $\alpha$- effect. In this picture, the drift of the sunspot formation latitudinal zone (“the butterfly diagrams”) and the reversal of the polar magnetic field are explained by magnetic diffusion of the dynamo-wave travelling in the convection zone along the isolines of the angular velocity ([@yosh1975; @b05; @2006AN....327..884K; @2013ASPC..479..395K]).

@1961ApJ...133..572B suggested an alternative mechanism in which the poloidal magnetic field originated from buoyant toroidal field loops which turned by the Coriolis force when they rise to the surface. This effect can be considered as a non-local $\alpha$ - effect [@bs02; @2007NJPh....9..305B; @2014arXiv1412.0997B]. This type of dynamo (sometimes called Babcock-Leighton dynamo) operates near the boundaries of the convection zone. In this dynamo mechanism the strong toroidal field is concentrated in the solar tachocline and the poloidal field is generated near the surface. In the dynamo model with the non-local $\alpha$ - effect, the solar type 