Sky watchers in Oregon, Washington, England and Canada have spotted 'noctilucent clouds,' the rarest on Earth
Noctilucent clouds, also known as polar mesospheric clouds, appear during the summertime in each hemisphere at about 50 miles high in the layer of the atmosphere called the mesosphere. They form when water vapor congregates around specks of meteor dust floating in the mesosphere and freezes, forming ice crystals.These thin, wavy icy clouds glow bright blue and white and typically appear around dusk or dawn.
She said the frequency of noctilucent clouds in the past few days has been higher than ever observed in at least 15 years of observations by the AIM mission. Yet the reason is a bit of mystery.Noctilucent clouds rely on two main ingredients in the mesosphere: plenty of water vapor and cold temperatures to aid ice crystal formation.
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