A Titan atmosphere with a surface temperature of 200K

Details A Titan atmosphere with a surface temperature of 200K A Titan atmosphere with a surface temperature of 200K

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978nascp2068..127h&link_type=abstract

In JPL The Saturn System p 127-140 (SEE N79-16758 07-91)

Computer Science

15

Atmospheric Composition, Atmospheric Models, Surface Temperature, Titan, Atmospheric Pressure, Brightness Temperature, Hydrogen, Methane, Nitrogen, Planetary Atmospheres, Planetary Surfaces

Scientific paper

The brightness temperature of Titan at 3 mm wavelength is around 200 K according to Ulich, Conklin, and Dickel (1978). Although an earlier measurement by Briggs is much colder, 200 K as the surface temperature was used to build an atmospheric model with a surface pressure of 21 bars. CH4 clouds form between 100 and 120 km altitude. The visual limb is near 200 km. The methane mixing ratio is 0.25 percent above the clouds and 7 percent below; the dominant gas is assumed to be N2. The thermal opacity is due to pressure-induced absorption in N2 and a trace (0.5 percent) of H2, with some help from cloud particles; unit opacity is reached at 600 mbar, 110 km from the surface. The radius of the solid body in this model is 2700 km, in reasonable agreement with 2600 km obtained if the density is the same as that of Ganymede and Callisto.

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