About: Noctilucent cloud

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About: Noctilucent cloud Sponge Permalink

An Entity of Type : dbkwik:resource/uStUxDIReK_DgOj6S-NX_Q==, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

Noctilucent clouds, also known as polar mesospheric clouds, are cloud-like phenomena in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. The name means roughly 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.

Attributes	Values
rdf:type	Cloud
rdfs:label	Noctilucent cloud
rdfs:comment	Noctilucent clouds, also known as polar mesospheric clouds, are cloud-like phenomena in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. The name means roughly 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.
sameAs	dbr:Noctilucent_cloud
image name	Noctilucent clouds over Lake Saimaa.
Level	other
dcterms:subject	Atmospheric optical phenomena Cloud types
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Name	Polar mesospheric cloud
precipitation	No
Image location	Noctilucent clouds over saimaa.jpg
Abbreviation	NLC/PMC
altitude ft	250000(xsd:integer)
altitude m	75000(xsd:integer)
abstract	Noctilucent clouds, also known as polar mesospheric clouds, are cloud-like phenomena in the upper atmosphere, visible in a deep twilight. They are made of crystals of water ice. The name means roughly 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 are the highest clouds in the Earth's atmosphere, located in the mesosphere at altitudes of around . They are normally too faint to be seen, and are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in the Earth's shadow. Noctilucent clouds are not fully understood and are a recently discovered meteorological phenomenon; there is no evidence that they were observed before 1885. Noctilucent clouds can form only under very restrictive conditions; their occurrence can be used as a sensitive guide to changes in the upper atmosphere. Since their discovery the occurrence of noctilucent clouds has been increasing in frequency, brightness and extent. It is theorised that this increase is connected to climate change, although since the phenomenon has been unknown until fairly recently it is also plausable more are noticed because now they are known to exist.

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