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Originally posted by BIGPoJo
reply to post by NadaCambia
Here is an earlier thread on the subject.
www.abovetopsecret.com...
In one well-known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence in the surrounding air or by local variation in air temperature or density, which may itself be the result of the stratification of the atmosphere. When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
Originally posted by Phage
The contrail in question has nothing to do with Aurora or pulse jets. Sometimes called donuts-on-a-rope, they are caused by interactions of contrails with wingtip vortices.
In one well-known example of this fact, the Crow Instability causes the vortices to develop symmetric sinusoidal oscillations and eventually to merge and form vortex rings behind the jet. This instability can be triggered by turbulence in the surrounding air or by local variation in air temperature or density, which may itself be the result of the stratification of the atmosphere. When the contrails are visible and strong, it is possible to see the white streaks become wavy and then leave rings floating high in the sky, like smoke rings from a giant cigar.
www.scientificamerican.com...
Where did the documentary get his claim for 8,000 MPH from then.