Fig6_2 Sunspot group

Fig6_2 Sunspot group

Fig. 6.2 . Intense magnetic fields emerge from the interior of the Sun through the Sunís visible disk, the photosphere, producing groups of sunspots. The sunspots appear dark because they are slightly cooler than the surrounding photosphere gas. This composite image was taken in white light, or all the colors combined. The enlarged image shows the biggest sunspot group, which is about 12 times larger than the Earth whose size is denoted by the black spot (lower left). (Courtesy of SOHO/ESA/NASA.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University