Sun Dogs are bright refractions of the Sun coming from horizontal ice crystals in the atmosphere. The ice crystals are usually oriented horizontally because that it their stable falling pattern. Watch as the rocket carrying the Solar Dynamic Observatory pierces through a cirrus cloud and the sound waves from the rocket completely obliterate the preferred ice crystal orientation.
http://www.spaceweather.com/swpod2010/11feb10/anna-herbst1.mov?PHPSESSID=ndlp741nbtasb6f51eloa6dp81
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