Polar stratospheric cloud | Wikipedia audio article
Channel: wikipedia tts
Date: 17/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Polar_stratospheric_cloud


00:00:49 1 Formation
00:02:23 2 Types
00:04:24 3 See also



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SUMMARY
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Polar stratospheric clouds (PSCs) are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 m (49,000–82,000 ft). They are best observed during civil twilight, when the Sun is between 1 and 6 degrees below the horizon, as well as in winter and in more northerly latitudes. One main type of PSC is made up mostly of supercooled droplets of water and nitric acid and is implicated in the formation of ozone holes.  The other main type consists only of frozen ice crystals and is not considered harmful. This type of PSC is also referred to as nacreous (, from nacre, or mother of pearl, due to its iridescence).