Web Definition: Sunspots
A sunspot is a region on the Sun s surface that is marked by a lower temperature than its surroundings & intense magnetic activity. Although they are blindingly bright, at temperatures of roughly 5000 K, the contrast with the surrounding material at some 6000 K leaves them clearly visible as dark spots. Interestingly, if they were isolated from the surrounding photosphere they would be brighter than an electric arc. Sunspot numbers have been measured since 1700 & estimated back to 1500. The trend is upward from 1900 to 1960s then somewhat downward . The number of sunspots correlates with the intensity of solar radiation. Since sunspots are dark it is natural to assume that more sunspots means less solar radiation. However the surrounding areas are brighter & the overall effect is that more sunspots means a brighter sun. The variation is small & was only established once satellite measurements of solar variation became available in the 1980s. During the Maunder Minimum there were hardly any sunspots at all & the earth may have cooled by up to 1° C.
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