Polar stratospheric clouds, also known as nacreous clouds, are clouds in the winter polar stratosphere at altitudes of 49,000–82,000 ft. They are best observed during twilight when the sun is between 1 and 6 degrees below the horizon - 02-02-16.
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Stratospheric Clouds
Polar stratospheric clouds, also known as nacreous clouds, are clouds in the winter polar stratosphere at altitudes of 49,000–82,000 ft. They are best observed during twilight when the sun is between 1 and 6 degrees below the horizon - 02-02-16.
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