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Optical Effects
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Noctilucent clouds are primarily composed of ice crystals at heights 50-70 miles above the earth's surface and form during the summer when temperatures in the mesosphere are coldest. Temperatures lower than about -120 degrees Celsius are required for its formation. This classic example was spotted during a flight between JFK airport in New York, US, and Heathrow airport in London, England.
Noctilucent clouds spotted over Lincolnshire, England
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Noctilucent clouds spotted over the Keyhaven River, near Lymington, Hampshire, England
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Noctilucent clouds spotted at 0300 BST over Winchester, England
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Signs of noctilucent spotted by Paul's twin brother, Richard, near Adlington, Cheshire, England
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Noctilucent clouds spotted by Julianna Dollinger's friend, Adam Cordero, over the Atlantic Ocean, on a flight to Spain
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Noctilucent spotted over Warmia-Masuria Voivodeship, Poland
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Noctilucent clouds appear well beyond the altitude of the altocumulus clouds along the horizon, as seen over Hull, East Yorkshire, England
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Noctilucent spotted at approximately 3:00 AM local time over Rechitsa, Belarus
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Signs of noctilucent clouds as Simon travelled overnight across the Atlantic Ocean, approaching Dublin, Ireland
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Noctilucent appearing before and after Midnight over Vilnius, Lithuania
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Noctilucent over Oxford, England
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Noctilucent over Santa Maria, United States
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Noctilucent over Zahran, Jordan
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Noctilucent clouds at pre-dawn over Englewood, Florida, US
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Noctilucent over Valley Mills, United States
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