Sunspots on the surface of the Sun. This optical image was taken on 23rd September 2000
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Sunspots on the surface of the Sun. This optical image was taken on 23rd September 2000
Sunspots on the surface of the Sun. This optical image was taken on 23rd September 2000, during the period of maximum activity in the solar cycle. Sunspots are cooler, darker areas on the Suns surface thought to be caused by interactions in the Suns magnetic field. They have a dark umbra surrounded by a lighter penumbra, and usually last a few weeks. They occur in two bands on either side of the solar equator, with those appearing later in the cycle being nearer the equator. The Sun has an 11-year period of activity, with its peak marked by an increase in sunspot numbers, flares and coronal mass ejections. At the end of the cycle the Suns magnetic field reverses
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Media ID 6444897
© ECKHARD SLAWIK/SCIENCE PHOTO LIBRARY
2000 Active Astrophysics Cosmology Maximum Observation Penumbra Solar Umbra
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