Aurora borealis

Aurora borealis

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Caption: 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.

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Keywords: arctic, atmosphere, atmospheric phenomenon, aurora borealis, aurorae, camp, camping, cold, earth science, earth's atmosphere, effects, electromagnetic effect, freezing, frozen, ice, magnetosphere, nature, night sky, northern lights, polar, remote, sciences, snow, solar activity, survival, tent, wilderness, wind

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