Golub, Leon, and Jay M. Pasachoff.Nearest Star: The Surprising Science of Our Sun. Harvard University Press, 2001. Detailed account of the scientific study of the Sun and of its effects upon Earth.
Phillips, Kenneth J. H.Guide to the Sun. Cambridge University Press, 1992, 1995. An account of what we now know about the sun from its interior and surface to its role in our solar system.
Taylor, Roger J.The Sun as a Star. Cambridge University Press, 1997. Perhaps the first fully realized discussion of how studies of the sun and the solar system help us understand stars in
general and other planetary systems; useful appendices.
Zirker, Jack B.Journey from the Center of the Sun. Princeton University Press, 2001. For the lay reader, an imaginary and informative voyage from the sun's core to the far reaches of the solar system.