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File:Crow instability contrail 1-9-08.JPG

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instability, named after its discoverer S. C. Crow. It is observed when the vortices caused by aircraft are being whirled from being otherwise straight contrails into spirals then donut-shaped rings.
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File:Crow instability contrail 1-9-08.JPG
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Creative Commons
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GNU Free Documentation License
Free Software Foundation
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depicts
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