Aurora borealis or northern lights display over a tent. Auroral displays are caused by interactions between energetic charged particles from the Sun and gas atoms and molecules about 100 kilometres up in the upper atmosphere. A stream of charged particles (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 these gas atoms and molecules,causing them to emit light | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Riedl, Martin |
Taille de l’image : | 3050 px × 4704 px |
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