Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsa42a..05m&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SA42A-05
Physics
0320 Cloud Physics And Chemistry, 0340 Middle Atmosphere: Composition And Chemistry, 1610 Atmosphere (0315, 0325), 3334 Middle Atmosphere Dynamics (0341, 0342), 6952 Radar Atmospheric Physics
Scientific paper
The scattering spectrum of polar mesospheric clouds (PMC) can be defined as the ratio of the scattered spectrum to the incident solar spectrum. Ultraviolet PMC spectra (200-315 nm) were accurately measured during the northern summer of 1999 by spectrographic imagers on the Midcourse Space Experiment (MSX) satellite. These spectra differ from a pure Rayleigh spectrum (which has a λ -4 dependence) and from the background dayglow spectrum (which itself is non-Rayleigh). To first order, the PMC spectra can be represented as the spectra of Mie scatterers with a log-normal distribution having modes of ˜50-70 nm and dispersions of ˜1.15-1.20. However, the PMC spectrum exhibits a peculiar (anomalous?) "hump" near λ =250 nm. This hump cannot be explained as an instrumental effect or a background contamination effect. The existence of this hump casts some shadow on the usual assumption of a lognormal distribution of Mie scatterers. The implications of this hump for the scattering distribution will be discussed.
Carbary J.
Morrison Douglas
Yee J.
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