Computer Science – Sound
Scientific paper
Mar 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..223w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 38, Mar. 1976, p. 223-238. Research supported by the Forskningsradens Rymd
Computer Science
Sound
18
Atmospheric Scattering, Light Scattering, Mesosphere, Polarimetry, Rocket Sounding, Sunlight, Molecular Absorption, Optical Polarization, Photometry, Radiance, Rocket-Borne Instruments
Scientific paper
The radiance and polarization of sunlight scattered by atmospheric molecules and possible deviations from molecular scattering during flight were studied by means of two rocket-borne photoelectric polarimeters with transmission bands centered at 256 nm and 536 nm. Both photometers detected increased scattering in a region between 85.5 and 89 km on both ascent and descent. The observed excess scattering is interpreted as being due to a weakly developed noctilucent cloud layer composed of water-coated particles. At altitudes below the particle layer, radiance is found to follow the theoretically predicted profile of molecular light scattering, the deviations from this profile being attributed to mechanical movements in the payload. The same pair of photometers also yielded information about two separate airglow emission features, both related to the photochemistry of nitrogen oxide. Signal depolarization at 536 nm is found to be consistent with an emission from the photochemical reaction between atomic oxygen and nitrogen oxide above 80 km.
Dye James E.
Wilhelm Nathan
Witt Georg
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