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noctilucent clouds - traduction vers arabe
![Noctilucent clouds over [[Laboe]], [[Germany]]](https://commons.wikimedia.org/wiki/Special:FilePath/Noctilucent-clouds-msu-6817.jpg?width=200 "Noctilucent clouds over [[Laboe]], [[Germany]]")
![Noctilucent clouds over [[Uppsala]], [[Sweden]]](https://commons.wikimedia.org/wiki/Special:FilePath/Noctilucent clouds over Uppsala, Sweden.jpg?width=200 "Noctilucent clouds over [[Uppsala]], [[Sweden]]")
![Noctilucent clouds over [[Daxing'anling Prefecture]], China during Summer Solstice](https://commons.wikimedia.org/wiki/Special:FilePath/夏至午夜拍摄的夜光云，中国大兴安岭地区漠河县，2018年6月22日.jpg?width=200 "Noctilucent clouds over [[Daxing'anling Prefecture]], China during Summer Solstice")
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فِعْل : تَغِيمُ السماء . يكفهرّ الوجه . يحجب بسحابة . يغشّي . يعتِّم . يلوّث
noctilucent clouds
Définition
Wikipédia
Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth. When viewed from space, they are called polar mesospheric clouds (PMCs), detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause. They consist of ice crystals and from the ground are only visible during astronomical twilight. Noctilucent roughly means "night shining" in Latin. They are most often observed during the summer months from latitudes between ±50° and ±70°. Too faint to be seen in daylight, they are visible only when the observer and the lower layers of the atmosphere are in Earth's shadow, but while these very high clouds are still in sunlight. Recent studies suggest that increased atmospheric methane emissions produce additional water vapor once the methane molecules reach the mesosphere – creating, or reinforcing existing noctilucent clouds. These clouds can last hundreds of years in the atmosphere, and are sometimes referred to as fossilized clouds because of their age.
They are the highest clouds in Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 km (249,000 to 279,000 ft).
