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.

Polar stratospheric cloud 
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Nube estratosférica polar (es); sarki sztratoszféra-felhő (hu); Құлпырма бұлттар (kk-kz); Glitský (is); Перламутровые облака (ru); Polare Stratosphärenwolken (de); قۇلپىرما بۇلتتار (kk-cn); ابر استراتوسفری قطبی (fa); 极地平流层云 (zh); 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); Құлпырма бұлттар (kk-cyrl); Perlemorsky (nn); Perlemorskyer (nb); Parelmoerwolk (nl); Polarni stratosferski oblaci (hr); Mây xà cừ (vi); Qulpırma bulttar (kk-tr); Перламутравыя воблакі (be); Polar stratospheric cloud (en); سحاب الستراتوسفير القطبي (ar); Qulpırma bulttar (kk-latn); Polarni stratosferski oblaci (sh) Particolare tipo di nubi (it) 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); Pärlmutterpilved, Pärlmutterpilv, Polaarstratosfääripilv, Polaarne stratosfääripilv, Polaarstratosfääripilved (et); Obłoki perłowe (pl); Polarstratosfäriskt moln, Polarstratosfäriska moln (sv); Perlemorskyer (nn); Polare Stratosphärenwolke, Perlmuttwolken, Stratosphärenwolke, Perlmutterwolke, Stratosphärenwolken, Polarwolken, Polarwolke (de); Helmiäispilvet (fi); Polārie stratosfēras mākoņi (lv); غيوم صدفية (ar); Polární stratosférický oblak, Nacreous (cs); Nuage nacre (fr)

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