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AIM

United States satellite
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Also known as: Aeronomy of Ice in the Mesosphere
Written by
Erik Gregersen
Erik Gregersen is a senior editor at Encyclopaedia Britannica, specializing in the physical sciences and technology. Before joining Britannica in 2007, he worked at the University of Chicago Press on the...
Erik Gregersen
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In full:
Aeronomy of Ice in the Mesosphere
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AIM, U.S. satellite designed to study noctilucent clouds. AIM was launched on April 25, 2007, by a Pegasus XL rocket that was dropped from an airplane. Noctilucent clouds are faint ice-bearing clouds that form at a height of about 80 km (50 miles) in the layer of the atmosphere called the mesosphere. These clouds were first seen in 1885 and have grown brighter since then. AIM carries experiments designed to study ice particles, chemicals, and interplanetary dust in the upper atmosphere in order to determine how noctilucent clouds form and why their brightness is changing. AIM found that noctilucent clouds ...(100 of 153 words)

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