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Shiny multi-colored clouds shining within the night time sky above Mount Jökultindur in Iceland on Jan. 25. (Picture credit score: Jónína Guðrún Óskarsdóttir)
The darkish skies within the Arctic Circle not too long ago shone with ethereal multi-colored gentle. However this jaw-dropping spectacle was not attributable to auroras. As an alternative, the iridescent rainbows have been attributable to clouds of tiny ice crystals floating greater within the environment than is often attainable.
The Arctic Circle (opens in new tab) clouds, often known as polar stratospheric clouds (PSC), solely type when the decrease stratosphere reaches temperatures beneath minus 114 levels Fahrenheit (minus 81 levels Celsius). Usually, clouds don’t type within the stratosphere as a result of it’s too dry, however at these extraordinarily low temperatures “widely-spaced water molecules start to coalesce into tiny ice crystals” that type into clouds, Spaceweather.com (opens in new tab) reported. This implies PSCs can type a lot greater up than regular clouds, between 9.3 and 15.5 miles (15 to 25 kilometers) above the bottom.
