Flat rainbows

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JohnD
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Joined: Wed Feb 16, 2005 2:11 pm
Location: Lancaster, England

Flat rainbows

Post by JohnD » Thu Jun 22, 2023 8:41 am

A recent EPOD featured a 'flat rainbow', with the usual colours appearing in a plane, over Paris as it happened. But without any explanation.
flat rainbow.jpg
Googling this I find that they are not unique, are sometimes called 'firebows' and associated with high clouds and water ice crystals rather that droplets, but the explanations are sketchy. Can anyone explain this picture and the 'flat rainbow' phenomenon, please?

JOhn
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Chris Peterson
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Re: Flat rainbows

Post by Chris Peterson » Thu Jun 22, 2023 1:38 pm

JohnD wrote: Thu Jun 22, 2023 8:41 am A recent EPOD featured a 'flat rainbow', with the usual colours appearing in a plane, over Paris as it happened. But without any explanation.
flat rainbow.jpg

Googling this I find that they are not unique, are sometimes called 'firebows' and associated with high clouds and water ice crystals rather that droplets, but the explanations are sketchy. Can anyone explain this picture and the 'flat rainbow' phenomenon, please?

JOhn
I'd suggest it's a circumhorizon arc.
Chris

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