Magnetic Structure of Sunspots

Juan M. Borrero 
Kiepenheuer-Institut für Sonnenphysik
Schöneckstr. 6, D-79104 Freiburg, Germany

Kiyoshi Ichimoto 
Kwasan and Hida Observatories
Kyoto University, Yamashina, Kyoto 607-8471, Japan


In this review we give an overview about the current state-of-knowledge of the magnetic field in sunspots from an observational point of view. We start by offering a brief description of tools that are most commonly employed to infer the magnetic field in the solar atmosphere with emphasis in the photosphere of sunspots. We then address separately the global and local magnetic structure of sunspots, focusing on the implications of the current observations for the different sunspots models, energy transport mechanisms, extrapolations of the magnetic field towards the corona, and other issues.

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