The solar dynamo and integrated irradiance variations in the course of the11-year cycle

The effect of the large-scale magnetic fields generated by the solar dynamo on the radiation flux issuing from the convection zone is studied. A gover ning equation describing convective heat transfer is obtained in the framew ork of mean-field magnetohydrodynamics, with account for the influence of m agnetic fields and differential rotation on the energy budget of the convec tion zone. The principal effects are illustrated using a one-dimensional nu merical model. Calculations indicate that the influence of large-scale magn etic fields can modulate the solar irradiance with a relative amplitude of similar to0.07%. (C) 2000 MAIK "Nauka/Interperiodica".