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| Admiring the Noctilucent Clouds by Kent Wien © July 22, 2008 Some rights reserved - Photostream
Noctilucent Clouds or "Night Clouds" are tenuous cloud-like phenomena that are the 'ragged-edge' of a much brighter and pervasive polar cloud layer called polar mesospheric clouds in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. Noctilucent roughly means night shining in Latin. They are most commonly observed in the summer months at latitudes between 50° and 70° north and south of the equator. They can only be observed when the Sun is below the horizon. - Continued at WiKi"
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Monday, August 19, 2013
Noctilucent Clouds
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