Category:Polar stratospheric clouds

**polar stratospheric cloud**
	clouds occurring in the stratosphere in high-latitude regions
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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.

See also categories: Iridescent clouds, Noctilucent clouds and Corona.

<nowiki>Nube estratosférica polar; Qulpırma bulttar; Құлпырма бұлттар; Glitský; Hodei polar estratosferiko; Перламутровые облака; Polare Stratosphärenwolken; Nivol de madrepèrla; قۇلپىرما بۇلتتار; ابر استراتوسفری قطبی; 极地平流层云; Nor stratosferic polar; 真珠母雲; Pärlemormoln; перламутрові хмари; helmiäispilvi; Құлпырма бұлттар; Perleťový oblak; nubi madreperlacee; nuage nacré; Polaarsed stratosfääripilved; Polarne chmury stratosferyczne; Polarni stratosferski oblaci; Nuvem estratosférica polar; قۇلپىرما بۇلتتار; Perlamutra mākoņi; Núvol estratosfèric polar; Perlamutriniai debesys; polarni stratosferski oblak; Полярни стратосферни облаци; Перламутравыя воблакі; Mây xà cừ; เมฆโพลาร์สตราโทสเฟียร์; perlemorsky; perlemorsky; Parelmoerwolk; Qulpırma bulttar; Polarni stratosferski oblaci; Құлпырма бұлттар; sarki sztratoszféra-felhő; polar stratospheric cloud; سحاب الستراتوسفير القطبي; पोलर स्ट्रेटोस्फेरिक क्लाउड; седефен облак; Particolare tipo di nubi; 成層圏にできる特殊な雲; Nuage de la stratosphère aux hautes latitudes.; ประเภทของเมฆ; тип тонких хмар, що є на великих висотах; bei sehr niedrigen Temperaturen auftretende Wolken in der Stratosphäre; pilvityyppi; clouds occurring in the stratosphere in high-latitude regions; نوع من السحب; väderfenomen; oblaki, ki se pojavljajo v stratosferi pri zelo nizkih temperaturah na območjih visokih geografskih širin; nakreolni oblak; stratosferski oblak; 極成層圏雲; 極成層雲; sarki sztratoszférikus felhő; Polarstratosfäriskt moln; Polarstratosfäriska moln; Obłoki perłowe; Pärlmutterpilved; Pärlmutterpilv; Polaarstratosfääripilv; Polaarne stratosfääripilv; Polaarstratosfääripilved; Polární stratosférický oblak; Nacreous; Polārie stratosfēras mākoņi; Nuage stratosphérique polaire; Polare Stratosphärenwolke; Perlmuttwolken; Stratosphärenwolke; Perlmutterwolke; Stratosphärenwolken; Polarwolken; Polarwolke; helmiäispilvet; väripilvi; Nacreous cloud; غيوم صدفية; поларен стратосферски облак; Nube polar estratosférica; Nube nacarada; Nube estratosferica polar; Nube polar estratosferica</nowiki>