ABSTRACT
This entry discusses some of the underlying physical processes that cause the Sun to appear and behave as it does. Magnetism makes the Sun interesting. Stored magnetic fields are buoyed to the surface from the interior, manifestly as sunspots, and then, the fields are pushed about by powerful convection forces, often to simply submerge and disappear, sometimes to be twisted into unstable flare-producing configurations, and sometimes to be ejected into the heliosphere and ultimately reaching the Earth.
