Sunspots on disc of Sun
Numéro d’image : 11884087
| Sunspots. Visible light image of the Sun,showing large sunspots. The dark colour of sunspots is due to their temperature being lower than the surrounding surface of the Sun. It is thought that intense localised magnetic fields inhibit the convection process that brings hot material to the surface. Sunspots are normally associated with intense solar activity. The number of sunspots varies with time according to a cycle which lasts about 11 years. Sunspot maxima are often linked to an increase in the strength of the solar wind - causing an increase in aurorae and interference to radio transmissions on Earth | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / NASA |
| Taille de l’image : | 2958 px × 2845 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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