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Polar stratospheric clouds or PSCs pärlemormoln 1 December 30 2019
Lappland Sweden
Polar stratospheric clouds or PSCs, also known as nacreous clouds (/ˈneɪkriː.əs/, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters (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
Polar stratospheric clouds or PSCs pärlemormoln 1 December 30 2019
Lappland Sweden
Polar stratospheric clouds or PSCs, also known as nacreous clouds (/ˈneɪkriː.əs/, from nacre, or mother of pearl, due to its iridescence), are clouds in the winter polar stratosphere at altitudes of 15,000–25,000 meters (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