Solar Dynamo Driven by Global Convection and Differential Rotation and the Magneto-Thermal Pulsation of the Sun

Abstract

Since 1972 when we proposed a mechanism of the solar dynamo driven by mass flows of global convection and differential rotation in the solar convection zone, each process that constitutes the complex machinery of the solar dynamo has been clarified step by step (Yoshimura 1972, 1975a, b, 1978a, b, 1979, 1981, 1983a, 1985, 1993b). We now know that the basic process of the dynamo can be visualized by topological deformation of stretching, winding, and folding of magnetic field lines in the solar convection zone by combined flows of the differential rotation and the global convection under influence of the rotation. In this paper, we briefly review the basic part of the dynamo process in terms of the topological deformation of the field lines and proceed to the second major step of advancement of understanding of the dynamo machinery achieved from analysis of observed evidences of nonlinear interaction of mass and heat flows and magnetic field in form of magnetic flux tubes of multiple spatial and temporal scales, which is a new category of solar phenomena called the magneto-thermal pulsation of the Sun.