At about 1 million F, this outer layer is cooler and has only about one-tenth the density of water. Energy is carried through this layer by the churning of the sun's gases. This churning, called convection, is created as energy radiates into space at the surface, thus cooling the gases there. Because of their higher densities, the cooled gases fall while hot gases constantly rise. But the convection zone is the region that drives much of what goes on at the surface.
Most dynamic things happen there.
This magnetism is inextricably tied to convection. The ionization level of the gas is related to its temperature and density, and temperature and density are determined by the vagaries of the ever-stirring sun. The ionized gases, in turn, serve as a great conductor, leaving convection and the magnetic field to constantly influence one another.