Aurora borealis

Aurora borealis

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Caption: Aurora borealis or northern lights display. Fish-eye lens viwe of the night sky during a display of aurora borealis. Aurorae are caused by the interaction between energetic charged particles from the Sun and gas molecules in the upper atmosphere of the Earth, 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 from north Finland.

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Keywords: activity, atmospheric phenomenon, aurora borealis, display, europe, finland, fish-eye lens, magnetosphere, night sky, northern lights, polar, poles, scandinavia, silhouette, silhouetted, solar wind, stars, trees

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