Aurora borealis
Numéro d’image : 11736518
| A spectacular aurora borealis display (northern lights) with red and blue lights. Aurorae are caused by the interaction between energetic charged particles coming from the Sun and molecules of gases in the upper atmosphere (about 100km). A stream of charged particles,known as the solar wind,flows continuously from the Sun's corona towards interplanetary space at speeds of 400-500 km/s. These particles do not reach the Earth's atmosphere due to the shielding effect of the Earth's magnetic field. However,violent solar activities such as solar flares emit highly energetic particles which penetrate this shield and ionise molecules in the atmosphere | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / PEKKA PARVIAINEN |
| Taille de l’image : | 3183 px × 4678 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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