Computer Science
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...51..466c&link_type=abstract
Icarus, vol. 51, Sept. 1982, p. 466-475.
Computer Science
30
Atmospheric Models, Atmospheric Temperature, Infrared Spectra, Microwave Spectra, Satellite Atmospheres, Titan, Absorptivity, Atmospheric Composition, Methane, Nitrogen, Spectrum Analysis, Temperature Dependence
Scientific paper
The pressure-induced absorptions of gaseous nitrogen (N2) and methane (CH4) are computed on the basis of the collisional lineshape theory of Birnbaum and Cohen (1976). Laboratory data at 300 and 124 K for N2 and at 296 and 195 K for CH4 are used to determine the collisional time constants and their temperature dependence. The spectrum of Titan from the microwave to the far-infrared region (0.1-600/cm) is then modeled using these opacities and a temperature profile of Titan's atmosphere derived from the Voyager 1 radio occultation experiment. The model atmosphere is composed of N2 and CH4, their relative proportions being determined by the vapor pressure law of CH4. A model with gaseous opacity alone is ruled out by the far-infrared observations. An additional opacity, thought to be associated with a methane cloud, is confirmed. The effective temperature of Titan is estimated at 83.2 plus or minus 1.4 K.
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