Solar Dynamo Model

Sunspots shows vortex structure& are approximated by SLVs (single layered vortices) at solar minima& MLVs (multi layered vortices) at solar maxima. Rolling magneto convection and rotation assosciated with the sunspot vortex is responsible for the dynamo action in it. The sunspot vortices in growing or decaying stage participate in meridonal circulations while moving in magnetically quantised solar latitudinal belts. This results in net variation in solar magnetic field and thus solar minima and maxima. The sun spot area (SSA, ie visible area of sunspot on photosphere) shows delay with respect to composite total solar irradiance (CTSI). Solar magnetic field (B) is cause of delay. Delay is maximum at solar minima& minimum at solar maxima. Poloidal component of magnetic field (BP) delays while toroidal component of magnetic field (BT) enhances the solar energy transportation. Over a period of 3 solar cycles, the analysis shows that wrt CTSI, SSA shows a delays of 13.5 days at solar maxima and 230 days at solar minima.