Circular Crow Contrail
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In the Black and White Thread Volume I I posted some pictures showing contrail with the effects of Crow instability. There is a lot of contrail over here and the effect of the Crow instability can be seen every now and then. Like yesterday. What was special was that the the contrail in some cases metamorphosed in chains of circles or separate circles showing clearly the circular motion of the vortices that the wingtips of the airplane seem to induce in the air.
The picture above shows contrail with rather typical Crow instability.
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It is not a von Karman vortex street I think. This should be V.C.I., vortex crow instability. Googling on this you will find examples like the first picture. I did not find examples on the internet of these perfectly circular leftovers of the contrail. They seem to be the last phase of the contrail before disappearing completely. There are also some recent examples on the gallery of this phenomenon. The wingtips of the airplane induce vortices that make these strange patterns in the contrail. Last few days over here were very favorable for this phenomenon and living near a lot of air traffic I could make a lot of new pictures of even stranger patterns.
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