Infrared spectral measurements (450-2500/cm) of shuttle-induced optical contamination

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Background Radiation, Earth Limb, Infrared Spectra, Near Fields, Spacecraft Contamination, Nitrogen Oxides, Space Shuttle Missions, Water Vapor

Scientific paper

The first shuttle-based infrared spectral measurements in the region beyond 800 nm were made during the STS-39 mission. A cryogenic Michelson interferometer in the Cryogenic Infrared Radiance Instrumentation for Shuttle (CIRRIS-1A) payload yielded high quality atmospheric IR spectra in the earthlimb observing mode. In addition, observations in the very high earthlimb and in the bay-to-space mode provided important opportunities to assess optical contamination. These observations have revealed spectrally-extended H2O and NO emissions as dominant in the region 450-2500/cm under quiescent conditions. The viewing conditions, spectral and 'spatial' (limb scan) distributions, and temporal behavior of the H2O emissions have resulted in their classification as shuttle-induced 'cloud glow' optical contamination.

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