Computer Science – Sound
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..261c&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, Feb. 7, 1992, p. 261-264.
Computer Science
Sound
16
Emission Spectra, Microwave Sounding, Nitric Oxide, Telescopes, Thermosphere, Atmospheric Composition, Atmospheric Temperature, Diurnal Variations, Environment Pollution, Solar Cycles
Scientific paper
The first microwave detection of atmospheric NO, obtained through ground-based observations of 250.796 GHz (1.2 mm) line emission from lower thermospheric NO is reported. The observations were conducted with the NRAO millimeter telescope at Kitt Peak, Arizona (32 deg N, 111 deg W) on April 1-3, 1991. The thermal linewidth of the measured NO spectrum corresponds to an average atmospheric temperature of 300 K which, combined with the observed lack of pressure broadening, places the origin of the NO emission at altitudes of 100-120 km. The thermospheric column (altitude is greater than 70 km) density of NO inferred from the observed line emission is 5.0 +1.5/-1.0 x 10 exp 14/sq cm, indicating extraordinarily high abundances of lower thermosphere NO for the current solar maximum period. During the three days of observations, the NO line emission did not exhibit diurnal or daily variations to within the 10-15 percent measurement uncertainties.
Clancy Todd R.
Muhleman Duane O.
Rusch David W.
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