Aurora borealis
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Aurora borealis
Aurora borealis over mountains. This coloured light display, also called the northern lights, is observed in the night sky at high latitudes. It occurs when charged and highly-energetic particles from the Sun (the solar wind) are drawn by Earths magnetic field to the northern and southern polar regions. Hundreds of kilometres up, they collide with the upper atmosphere, causing the excitation of atoms and molecules which leads to the emission of light. Oxygen atoms (rather than molecules) are the most abundant components of the atmosphere at these heights. It is their excitation that results in green light. Photographed in October 2001, in British Columbia, Canada
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Media ID 6376663
© ALAN SIRULNIKOFF/SCIENCE PHOTO LIBRARY
2001 Arctic Atmosphere Atmospheric Effect Atmospheric Phenomenon Aurora Borealis Aurorae British Columbia Canada Canadian D Usk Dawn Earth Science Effects Electromagnetic Effect Glow Glowing High Latitude Light Emission Mountain Mountains Natural Phenomenon Night Sky Northern Lights October Polar Sciences Silhouette Silhouetted Solar Activity Twilight
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