Although the Sun is our closest star by many orders of magnitude and despite
having sunspot records stretching back to ancient China, our knowledge of the
Sun's magnetic field is far from complete. Indeed, even now, after decades of
study, the most obvious manifestations of magnetic fields in the Sun (e.g.
sunspots, flares and the corona) are scarcely understood at all. These failures
in spite of intense effort suggest that to improve our grasp of magnetic fields
in stars and of astrophysical dynamos in general, we must broaden our base of
White Paper submitted to the Stars and Stellar Evolution Panel of the Astro2010 Decadal
Survey
