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reverse rainbow
Reverse Rainbow over Alpe di Succiso group.
This may look like a colourful smile in the sky - but in fact it's an upside down rainbow caused by freak weather.
Normal rainbows are made when rays of sunlight penetrate raindrops and emerge from other side creating a prism of colours in an arc.
But if the sunlight strikes ice crystals high in the atmosphere at the right angle they are reflected back the way they came, creating a reverse rainbow.
reverse rainbow
Reverse Rainbow over Alpe di Succiso group.
This may look like a colourful smile in the sky - but in fact it's an upside down rainbow caused by freak weather.
Normal rainbows are made when rays of sunlight penetrate raindrops and emerge from other side creating a prism of colours in an arc.
But if the sunlight strikes ice crystals high in the atmosphere at the right angle they are reflected back the way they came, creating a reverse rainbow.