On the mean particle size and water content of polar mesospheric clouds

Details On the mean particle size and water content of polar mesospheric clouds On the mean particle size and water content of polar mesospheric clouds

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1209t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Oct. 1985, p. 1209-1224. NASA-NSF-supported research.

Computer Science

64

Clouds (Meteorology), Mesosphere, Moisture Content, Particle Size Distribution, Polar Regions, Emission Spectra, Solar Mesosphere Explorer, Ultraviolet Spectra

Scientific paper

Results from the ultraviolet spectrometer experiment (UVS) aboard the Solar Mesospheric Explorer, which measures ultraviolet sunlight scattered from air molecules in the mesosphere, are reported and discussed. The UVS experiment, its observing modes, and details of the observing sequence are described. The data are compared with predictions of Mie scattering theory, assuming the size distribution is parameterized by a mean radius and a width parameter. The water ice content, mean particle radius, and column number are calculated as a function of cloud brightness, and in terms of the unknown width parameter. It is concluded that polar mesospheric cloud particles are quite small, having average volume-effective radii less than 70 mm, and that clouds differ in their optical properties mainly as a result of their mean particle size.

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