Sunspots (dark areas) on the surface of the Sun. Sunspots are areas of magnetic activity that are cooler than the rest of the Sun's surface. They range in size from hundreds to thousands of kilometres across. The darkest regions (nearly vertical magnetic fields) are the umbras,surrounded by penumbras (bronze regions). The yellow background consists of convection cells called solar granules,each around 1000 kilometres across. This group of sunspots,designated AR 1793,appeared on the Sun's limb and were observed with a Baader white light filter on 17 July 2013 | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Peach, Damian |
Taille de l’image : | 4995 px × 3547 px |
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