The purpose of this course is to present an introduction to the physics of the Sun. Topics will include the physics of solar magnetic fields, solar interior and helioseismology, radiative transfer, solar wind, and solar-energetic particles. This course will introduce the equations of magnetohydrodynamics and apply them to important solar-physics problems. Examples include: the solar dynamo, the physics of sunspots and flares, origin of the solar wind, and the structure of the solar atmosphere. The emphasis throughout will be on basic physical processes and the various approximations used in their application to realistic and relevant problems. Identical to ASTR/ATMO/PHYS 537. PTYS is home department.