Category:Polar stratospheric clouds

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Polar stratospheric clouds (also called Nacreous clouds) are distinct from ordinary Iridescent clouds: they only appear at high latitude regions, they form in the stratosphere, about 20 km high; they are made either of ice crystals, or of compounds of water and nitric or sulphuric acids.

The iridescence is the result of diffraction around those very small and homogeneous particles, just like in ordinary iridescent clouds and Coronae.

They are also distinct from Noctilucent clouds, which are typically 80 km high.

Nube estratosférica polar (es); sarki sztratoszféra-felhő (hu); Құлпырма бұлттар (kk-kz); Glitský (is); Núvol estratosfèric polar (ca); Polare Stratosphärenwolken (de); Nivol de madrepèrla (lmo); قۇلپىرما بۇلتتار (kk-cn); ابر استراتوسفری قطبی (fa); Полярни стратосферни облаци (bg); Nor stratosferic polar (ro); 真珠母雲 (ja); Pärlemormoln (sv); Перламутрові хмари (uk); Helmiäispilvi (fi); Құлпырма бұлттар (kk); Perleťový oblak (cs); nubi madreperlacee (it); nuage nacré (fr); Polaarsed stratosfääripilved (et); Nuvem estratosférica polar (pt); قۇلپىرما بۇلتتار (kk-arab); Perlamutra mākoņi (lv); Perlamutriniai debesys (lt); Polarne chmury stratosferyczne (pl); Polarni stratosferski oblaci (hr); เมฆโพลาร์สตราโทสเฟียร์ (th); Qulpırma bulttar (kk-tr); Құлпырма бұлттар (kk-cyrl); perlemorsky (nn); perlemorsky (nb); Parelmoerwolk (nl); Перламутравыя воблакі (be); Mây xà cừ (vi); Qulpırma bulttar (kk-latn); Polarni stratosferski oblaci (sh); Polar stratospheric cloud (en); سحاب الستراتوسفير القطبي (ar); Перламутровые облака (ru); 极地平流层云 (zh) Particolare tipo di nubi (it); نوع من السحب (ar); clouds occurring in the stratosphere in high-latitude regions (en); pilvityyppi (fi) Nube polar estratosférica, Nube nacarada, Nube estratosferica polar, Nube polar estratosferica (es); 極成層圏雲, 極成層雲 (ja); sarki sztratoszférikus felhő (hu); Polarstratosfäriskt moln, Polarstratosfäriska moln (sv); Obłoki perłowe (pl); Polare Stratosphärenwolke, Perlmuttwolken, Stratosphärenwolke, Perlmutterwolke, Stratosphärenwolken, Polarwolken, Polarwolke (de); Helmiäispilvet (fi); Pärlmutterpilved, Pärlmutterpilv, Polaarstratosfääripilv, Polaarne stratosfääripilv, Polaarstratosfääripilved (et); غيوم صدفية (ar); Polární stratosférický oblak, Nacreous (cs); Polārie stratosfēras mākoņi (lv)
Polar stratospheric cloud 
clouds occurring in the stratosphere in high-latitude regions
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