noctilucent clouds"(Rarely called luminous clouds.) Thin silvery-blue cirrus-like clouds frequently seen during summer twilight conditions at high latitudes (above 50°) in both hemispheres.
Noctilucent clouds
Wavy, thin clouds that are seen at twilight in polar regions. They form at altitudes of 80-90 km and are made visible by sunlight reflecting off the underside of the cloud.
Nocturnal ...
NOCTILUCENT CLOUDS Rarely seen clouds of tiny ice particles that form approximately 75 to 90 kilometers above the earth's surface. They have been seen only during twilight (dusk and dawn) during the summer months in the higher latitudes.
Noctilucent Clouds
Wavy, thin, bluish-white clouds that are best seen at twilight in polar latitudes. They form at altitudes about 80 to 90 km above the Earth's surface.
Nocturnal ...
Noctilucent clouds Wavy, thin clouds resembling cirrus, but usually bluish-white or silvery; best seen at high latitudes just before sunrise or just after sunset.
noctilucent clouds—Clouds of unknown composition which occur at great heights, probably around 75 to 90 kilometers.
Noctilucent clouds These are rarely seen wavy, thin bluish or silvery clouds.
Noctilucent clouds over Lake Saimaa
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Noctilucent Clouds: Mystery in the High Atmosphere
Noctilucent Clouds Photo Gallery
Cumulus Humilis: A Fair Weather Cloudscape
How Do Clouds Float?
A Springtime Cloud-Watching Kind Of A Day
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and standards of observing, with individual chapters relating to the principal elements to be observed, e.g. clouds, visibility, weather, wind etc. A useful section on observing and recording special optical phenomena, e.g. halo, noctilucent clouds ...
 See also: Clouds, Noctilucent cloud, Cloud, High, Element
  
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