Aurora borealis

Numéro d’image : 11736646
Aurora borealis
Aurora borealis. Wide-angled view of an aurora borealis or northern lights display during cloudy weather over an urban area. Aurorae are caused by the interaction between energetic charged particles from the Sun and gas molecules in the upper atmosphere about 100 kilometres up. A stream of charged particles,called the solar wind,flows out into space continuously from the Sun at speeds of 400-500 kilometres per second. On reaching Earth,the charged particles are drawn by Earth's magnetic field to the poles,where they collide with gas molecules in the upper atmosphere,causing them to emit light. Photographed in Finland on 20 November 2003
Licence : Droits gérés
Crédit: Science Photo Library / PEKKA PARVIAINEN
Taille de l’image : 5401 px × 3551 px
Model Release : Non requis
Property Release : Non requis
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