Sunspots: from small-scale inhomogeneities towards a global theory
arXiv:0811.2747 · doi:10.1007/s11214-008-9465-6
Abstract
The penumbra of a sunspot is a fascinating phenomenon featuring complex velocity and magnetic fields. It challenges both our understanding of radiative magneto-convection and our means to measure and derive the actual geometry of the magnetic and velocity fields. In this contribution we attempt to summarize the present state-of-the-art from an observational and a theoretical perspective.
Accepted for publication in Space Science Reviews
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