File:Aurora Australis From ISS edit1.JPG

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The aurora has a sinuous ribbon shape that separates into discrete spots near the lower right corner of the image. While the dominant coloration of the aurora is green, there are faint suggestions of red left of image center. Dense cloud cover is dimly visible below the aurora. The curvature of the Earth’s horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center). Several stars appear as bright pinpoints against the blackness of space at image top right.
 
The aurora has a sinuous ribbon shape that separates into discrete spots near the lower right corner of the image. While the dominant coloration of the aurora is green, there are faint suggestions of red left of image center. Dense cloud cover is dimly visible below the aurora. The curvature of the Earth’s horizon (the limb) is clearly visible, as is the faint blue line of the upper atmosphere directly above it (at image top center). Several stars appear as bright pinpoints against the blackness of space at image top right.
 

 

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Auroras happen when ions in the solar wind collide with atoms of oxygen and nitrogen in the upper atmosphere. The atoms are excited by these collisions, and they typically emit light as they return to their original energy level. The light creates the aurora that we see. The most commonly observed color of aurora is green, caused by light emitted by excited oxygen atoms at wavelengths centered at 0.558 micrometers, or millionths of a meter. (Visible light is reflected from healthy (green) plant leaves at approximately the same wavelength.) Red aurora are generated by light emitted at a longer wavelength (0.630 micrometers), and other colors such as blue and purple are also sometimes observed.}}
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Auroras happen when ions in the solar wind collide with atoms of oxygen and nitrogen in the upper atmosphere. The atoms are excited by these collisions, and they typically emit light as they return to their original energy level. The light creates the aurora that we see. The most commonly observed color of aurora is green, caused by light emitted by excited oxygen atoms at wavelengths centered at 0.558 micrometers, or millionths of a meter. (Visible light is reflected from healthy (green) plant leaves at approximately the same wavelength.) Red aurora are generated by light emitted at a longer wavelength (0.630 micrometers), and other colors such as blue and purple are also sometimes observed.
 
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{{ISS Crew Earth Observations
 
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|mission= ISS023
 
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|roll= E
 
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|frame= 58455
 
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|geoname= INDIAN OCEAN
 
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|features= AURORA AUSTRALIS, CLOUDS, EARTH LIMB, STARS
 
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|cp-lat=
 
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|cp-long=
 
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|camera-tilt= High Oblique
 
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|camera-fl=
 
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|camera= Nikon D3
 
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|film= 4256 x 2832 pixel CMOS sensor, 36.0mm x 23.9mm, total pixels: 12.87 million, Nikon FX format.
 
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|exposure=
 
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|cloudcover= 75
 
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|date= 2010-05-29
 
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|time= 16:11:36
 
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|nadirlat= -51.2
 
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|nadirlong= 93.3
 
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|nadirdirection=
 
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|azimuth= 220
 
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|issalt= 189
 
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|sunelevation= -56
 
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|orbitnumber= 2055}}}}
 
|Source=[http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS023&roll=E&frame=58455 Mission: ISS023 Roll: E Frame: 58455 Mission ID on the Film or image: ISS023]
 
|Source=[http://eol.jsc.nasa.gov/scripts/sseop/photo.pl?mission=ISS023&roll=E&frame=58455 Mission: ISS023 Roll: E Frame: 58455 Mission ID on the Film or image: ISS023]
 
|Author=ISS Expedition 23 crew
 
|Author=ISS Expedition 23 crew

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