Saturn's microwave spectrum: Implications for the atmosphere and the rings

Details Saturn's microwave spectrum: Implications for the atmosphere and the rings Saturn's microwave spectrum: Implications for the atmosphere and the rings

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978nascp2068..195k&link_type=abstract

In Its The Saturn System p 195-216 (SEE N79-16758 07-91)

Computer Science

4

Atmospheric Composition, Microwave Spectra, Saturn Atmosphere, Saturn Rings, Ammonia, Atmospheric Models, Brightness Temperature, Planetary Atmospheres

Scientific paper

Measurements of Saturn's disk temperature are compiled to determine the planet's microwave spectrum from 1 mm to 100 cm wavelength. The data were adjusted to conform with a common flux density scale. A model of Saturn's rings is used to remove the effects of the rings from the atmospheric component at centimeter and decimeter wavelengths. Theoretical spectra for a number of convective atmospheric models were computed and compared with the observed spectrum. Radiative-convective models with approximately solar composition and with an effective temperature of approximately 89 K are in good agreement with the observations. The agreement between the observed and theoretical spectra is a strong indication that gaseous ammonia is present in Saturn's atmosphere. A good fit to the data is obtained with an ammonia mixing ratio of approximately 5 x 10,0001. A comparison of the millimeter wavelength data with the best-fitting atmospheric spectrum indicates that the thermal component of the ring brightness temperature near 1 mm wavelength is approximately 25 k.

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