Sunspots are areas seen as a dark spot on the [[photosphere]] of the Sun; sunspots are concentrations of [[magnetic field|magnetic flux]], typically occurring in bipolar clusters or groups; they appear dark because they are cooler than the surrounding photosphere. | Sunspots are areas seen as a dark spot on the [[photosphere]] of the Sun; sunspots are concentrations of [[magnetic field|magnetic flux]], typically occurring in bipolar clusters or groups; they appear dark because they are cooler than the surrounding photosphere. |