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noctilucent cloud |
Also found in: Wikipedia, Hutchinson | 0.02 sec. |
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noctilucent cloud [¦näk·tə¦lü·sənt ′klau̇d] (meteorology) A cloud of unknown composition which occurs at great heights and high altitudes; photometric measurements have located such clouds between 45 and 54 miles (75 and 90 kilometers); they resemble thin cirrus, but usually with a bluish or silverish color, although sometimes orange to red, standing out against a dark night sky. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Gardner's team found that the mesospheric clouds over the South Pole were, on average, at an altitude of 85. The scientific mission of the AIM satellite program is focused on the study of Polar Mesospheric Clouds (PMCs) that form about 50 miles above the Earth's surface in the summer months, primarily in the polar regions. |
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