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Originally posted by luxordelphi
Very illustrative pictures of the metallic rainbows brought to us by chemtrails in the name of weather modification. Can this stuff be good to breathe? Or does it stay stratospheric far from our lungs? I like the rainbows of yore - without the metallic highlights.
Originally posted by Essan
Excellent pictures A circumhorizon arc captured in a contrail
www.atoptics.co.uk...
Not yet managed one myself. But always hoping!
The arc is usually* produced by plate oriented crystals. Sunlight enters a near vertical side face and leaves via the lower near horizontal face. The refraction of the almost parallel solar rays through faces inclined at 90° produces the pure, bright and well separated prismatic colours. The colours are purer than those of the rainbow.
When the sun is ~58° high the outgoing ray grazes the crystal lower face (see left) . When the sun is lower still the ray is internally reflected by the lower face and no CHA is formed.
The CHA is closely related to the equally pure coloured circumzenithal arc. The latter is formed when sunlight enters the crystal top face and leaves a side face.
How often you see the arc depends on where you are. In the USA you might see a circumhorizon arc (CHA) five or more times each summer. In middle latitude Europe you will be lucky to see a CHA once. In northern Europe they are impossible to see at any latitude north of Copenhagen.
Originally posted by mb2591
Nice I like how the rainbow starts red and gets more pronounced. Very interesting pics.
Originally posted by Uncinus
Originally posted by mb2591
Nice I like how the rainbow starts red and gets more pronounced. Very interesting pics.
Technically it's not a rainbow, as it's made from ice crystals, and the sun is in front of the viewer, and not behind.
It starts red and gets more pronounced as the contrail is not lined up with the arc. So first it's just showing the red part, and then more of the other colors.
The arc is always there (when the sun is in the right position), just you can't see it unless there's the right kind of ice crystals in the right position. The contrail reveals the arc, like a ColorBlast pen reveals its colors:
[atsimg]http://files.abovetopsecret.com/images/member/978c1c2acf51.jpg[/atsimg]
Originally posted by luxordelphi
Very illustrative pictures of the metallic rainbows brought to us by chemtrails in the name of weather modification. Can this stuff be good to breathe? Or does it stay stratospheric far from our lungs? I like the rainbows of yore - without the metallic highlights.
Originally posted by mb2591
Originally posted by Uncinus
Technically it's not a rainbow, as it's made from ice crystals, and the sun is in front of the viewer, and not behind.
Thank you but Im pretty sure what you just defined is a rainbow(water droplets bending the suns light)..
Rainbows are formed by refraction and reflection of sunlight by raindrops. When sunlight passes through ice crystals, halos form and they are mostly coloured . Small cloud or fog droplets diffract light to form ringed glories, coronae and the jumbled colours of iridescent clouds.