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); Hodei polar estratosferiko (eu); Núvol estratosfèric polar (ca); Polare Stratosphärenwolken (de); Nivol de madrepèrla (lmo); 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); Polarne chmury stratosferyczne (pl); Perlamutriniai debesys (lt); Polarni stratosferski oblaci (hr); Құлпырма бұлттар (kk-cyrl); Qulpırma bulttar (kk-tr); Перламутравыя воблакі (be); เมฆโพลาร์สตราโทสเฟียร์ (th); perlemorsky (nn); perlemorsky (nb); Parelmoerwolk (nl); Mây xà cừ (vi); Qulpırma bulttar (kk-latn); Polarni stratosferski oblaci (sh); पोलर स्ट्रेटोस्फेरिक क्लाउड (bho); Polar stratospheric cloud (en); سحاب الستراتوسفير القطبي (ar); Перламутровые облака (ru); Полярни стратосферни облаци (bg) Particolare tipo di nubi (it); Nuage de la stratosphère aux hautes latitudes. (fr); pilvityyppi (fi); clouds occurring in the stratosphere in high-latitude regions (en); نوع من السحب (ar); тип тонких хмар, що є на великих висотах (uk) Nube polar estratosférica, Nube nacarada, Nube estratosferica polar, Nube polar estratosferica (es); 極成層圏雲, 極成層雲 (ja); Nuage stratosphérique polaire (fr); Polarstratosfäriskt moln, Polarstratosfäriska moln (sv); Obłoki perłowe (pl); Pärlmutterpilved, Pärlmutterpilv, Polaarstratosfääripilv, Polaarne stratosfääripilv, Polaarstratosfääripilved (et); Polārie stratosfēras mākoņi (lv); Polare Stratosphärenwolke, Perlmuttwolken, Stratosphärenwolke, Perlmutterwolke, Stratosphärenwolken, Polarwolken, Polarwolke (de); helmiäispilvet, väripilvi (fi); Nacreous cloud (en); غيوم صدفية (ar); Polární stratosférický oblak, Nacreous (cs); sarki sztratoszférikus felhő (hu)
Polar stratospheric cloud 
clouds occurring in the stratosphere in high-latitude regions
Nacreous clouds Antarctica.jpg
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