title: Magnetic Structure of Sunspots.
abstract: 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.
  
  
  BACKGROUND
  Supplementary material is available for this article at 10.12942/lrsp-2011-4.
authors.affiliation: Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, Freiburg, D-79104 Germany.
authors.forename: Juan M
authors.initials: JM
authors.lastname: Borrero
authors.affiliation: Kwasan and Hida Observatories, Kyoto University, Yamashina, Kyoto, 607-8471 Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Ichimoto