Physics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..142o&link_type=abstract
Icarus, vol. 26, Oct. 1975, p. 142-158.
Physics
17
Abundance, Ammonia, Infrared Radiometers, Jupiter Atmosphere, Pioneer 10 Space Probe, Planetary Temperature, Atmospheric Composition, Atmospheric Temperature, Cloud Physics, Limb Darkening, Methane, Optical Thickness
Scientific paper
Observations of Jovian limb structure at 8.11 and 8.45 microns are reported. These are used along with other limb structure and spectral data in the 8-14 micron region to derive a model of the thermal and cloud structure within the 1.0-0.01 bar pressure regime. The temperature is about 165 K at 1.00 bar, 108 K at 0.10 bar, and 143 K at 0.03 bar. In zones, an optically opaque cloud of NH3 exists near the 143 K (0.60 bar) level. A partly transparent haze of solid NH3 particles overlies the cloud. Belts are free of the cloud and have a much lower abundance of NH3 haze than the zones. The data are consistent with an NH3 gas abundance defined by saturation equilibrium, with a mixing ratio of 0.00015 deep in the atmosphere, and with a CH4 mixing ratio of 0.002, about three times the currently accepted value.
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