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A curved contrail over Ningbo, China
Noctilucent clouds near Kemerovo, Russia
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A sky decorated with contrails (homogenitus), which form when it’s cold enough and moist enough at high altitudes, and the water vapour contained in the plane’s hot exhaust gases mixes with the very cold air to condense and form ice crystals, which took place here multiple times over Charente, France
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An aircraft condensation trail with the 'zipper' appearance that can sometimes be produced by the effect of turbulence around the aircraft wings.
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A Kelvin-Helmholtz formation over Big Bend, Texas, US.
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An example of Crow Instability over Bigfork, Montana, US.
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A sundog over Morecambe Bay, England.
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Contrail chaos over Virginia Beach, Virginia, US.
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Crow Vortex Instability in a contrail over Neath, South Wales.
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A criss-crossing of contrails over Aberporth, West Wales.
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A waffle in the clouds over Prescott Valley, Arizona, US.
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A sky filled with playful contrails over Burlington, Vermont, US.
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An example of vortex crow instability, it occurs when the wingtip vortices interact with the aircrafts contrails. Spotted over Petersfield, Hampshire, England.
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A circumhorizon arc over Pendleton County, West Virginia, US.
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Spinal columns over West Valley City, Utah, US.
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A colourful contrail over Banbridge, Northern Ireland.
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