Night clouds or noctilucent 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.Wednesday, January 9, 2013
Noctilucent Cloud
Night clouds or noctilucent 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.
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