Computer Science – Sound
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.4067n&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, May 1, 1988, p. 4067-4075.
Computer Science
Sound
12
Atmospheric Chemistry, Emission Spectra, Satellite Sounding, Sodium, Upper Atmosphere, Dmsp Satellites, Line Of Sight, Night, Ozone, Polar Orbits
Scientific paper
Limb scans of nighttime sodium doublet emissions at 589 nm were performed globally from a sun-synchronous satellite during July 1979. The observations have provided a global description of variation in the emitting layer with latitude and altitude. The limb scan data are consistent with the presence of a 10-km-thick emitting layer near the 90-km peak of the sodium density in the northern mid-latitude mesosphere in summer. At equatorial and southern latitudes, however, a narrower emission layer occurs 5-10 km lower, and the intensity is stronger by a factor of 3 or more. It appears likely that the shape of the Na D emission profile is influenced by the altitude distributions of both sodium and ozone, the reactants which are necessary to produce the emission. The observed variability may be explained by a systematic seasonal mismatch in the altitude of the mesospheric density maxima for sodium and ozone, combined with a known threefold wintertime increase in sodium density.
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