Aurora borealis
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Aurora borealis
Aurora borealis or northern lights display. 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 Earths magnetic field to the poles, where they collide with gas molecules in the upper atmosphere, causing them to emit light. Photographed from northern Finland on 29 October 2003
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Media ID 6375161
© PEKKA PARVIAINEN/SCIENCE PHOTO LIBRARY
Activity Atmospheric Phenomenon Aurora Borealis Aurorae Country Side Dark Earth Science Effects Electromagnetic Effect Finland Finnish Light Luminous Meteorological Meteorology Night Northern Lights Optical Effect Out Side Outdoors Polar Poles Purple Rural Sc Andinavian Scandinavia Sciences Solar Wind Speed Of Light Star Field Stars Storm Weather
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