Polar Mesospheric Clouds Posted on April 30, 2014 by Stephen - TopicsExpress

Polar Mesospheric Clouds Posted on April 30, 2014 by Stephen Smith ----NLCs are thought to be normal clouds, except that they are composed of ice crystals that form on so-called “meteor smoke”, or the microscopic ash left behind by meteors that burn-up in the mesosphere. However, one major characteristic is their filamentary structure, with obvious long tendrils. Another aspect of NLCs that is largely ignored is that they exhibit “high radar reflectivity” over a wide range: from 50 megahertz to 1.3 gigahertz.--- Noctilucent clouds over the Arctic. Credit: NASA/AIM

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