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Home Environment Climate

‘Upside down rainbow’ caused by freak weather

Mihai Andrei by Mihai Andrei
January 27, 2021
in Climate, Feature Post, Great Pics
Reading Time: 1 min read
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Image via Youtube. CC BY 3.0


Every once in a while we get a sign that the weather around the planet is changing, and not for the good. This kind of rainbow needs very specific conditions to form, similar to those in the North Pole, and it appeared above Britain.

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Rainbows are formed in a very simple way (details), when light goes through a raindrop for example and goes out the other side, but this other kind of rainbow requires something else to form; it forms when sunlight bounces off ice crystals high in the atmosphere, which sends the sun rays back up.

This smiley face in the sky is something few people have ever seen, and even in remote and wild places, let alone in the heart of European civilisation. The picture was captured by astronomer Dr Jacqueline Mitton from her house near Cambridge. Here is what she had to say.

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“I’ve never seen anything like it before – and I’m 60. The conditions have to be just right: you need the right sort of ice crystals and the sky has to be clear. We’re not sure how big an area it was visible over, but it was certainly very impressive.”

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Tags: environmentinverted rainbowrainbowweather
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Mihai Andrei

Mihai Andrei

Andrei's background is in geophysics, and he's been fascinated by it ever since he was a child. Feeling that there is a gap between scientists and the general audience, he started ZME Science -- and the results are what you see today.

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