Aurora borealis

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Aurora borealis

Aurora borealis or northern lights display, seen from the International Space Station (ISS). This viewpoint allows study of the vertical variations in the aurorae. Auroral displays are caused by interactions between energetic charged particles from the Sun and the Earths atmosphere. Moving at 400-500 kilometres a second, the charged particles of the solar wind are drawn by Earths magnetic field to the poles, where they collide with gas atoms and molecules, causing them to emit light. Green light comes from oxygen atoms. The displays can be hundreds of kilometres above the Earth. The ISS orbits around 380 kilometres above the Earth. Photographed on 4 October 2001, over Canada

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Media ID 6375115

© NASA/SCIENCE PHOTO LIBRARY

2001 Arctic Atmosphere Atmospheric Phenomenon Aurora Borealis Aurorae Canada Canadian Earth Observation Earth Science Effects Electromagnetic Effect From Space International Space Station Magnetosphere Night Northern Lights October Polar Satellite Sciences Solar Activity Weather Wind

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