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Meteorology (Weather)/Rainbow cloud formation- Irisation

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Clouds
Clouds  
Hello. I observed this cloud formation outside our office window. It looks like a contrail, but one end is rainbow-hued. What's going on here?
Thanks!
(please see attached)

Answer
Hi Brian

Probably the engine settings changed at that moment increasing the drop-size of moisture in the exhaust.

However, you should look at the following for more info:

http://www.cs.cmu.edu/~zhuxj/astro/html/irisation.html

http://contrailscience.com/aerodynamic-and-rainbow-contrails/

http://www.dailykos.com/story/2012/02/05/1062039/-Contrails

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Donald Rosenfeld

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