Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...81..396h&link_type=abstract
Icarus (ISSN 0019-1035), vol. 81, Oct. 1989, p. 396-412.
Astronomy and Astrophysics
Astronomy
9
Ammonia, Limb Darkening, Microwave Attenuation, Satellite Observation, Uranus Atmosphere, Very Large Array (Vla), Brightness Temperature, Infrared Astronomy Satellite, Voyager Project, Uranus, Ammonia, Atmosphere, Microwave Methods, Wavelengths, Depletion, Polar Regions, Latitude, Abundance, Models, Composition, Temperature, Absorption, Brightness, Spectra, Mixing, Pressure, Circulation, Depth
Scientific paper
A 2-cm wavelength VLA map of Uranus is found upon analysis to display strong limb darkening and a lack of symmetry about the subearth point, perhaps due to a latitudinally varying NH3 mixing ratio. The change in NH3 abundance occurs near -45 deg latitude, and the calculated NH3 molar mixing ratios in the 5-20 bar region average 4.9 + or - 0.7 x 10 to the -7th at -90 to -45 deg latitudes, and 1.3 + or - 0.4 x 10 to the -6th at -45 to -15 deg latitudes. The model is in agreement both with previous work indicating the depletion of ammonia relative to solar abundance and a preliminary analysis of 6-cm data.
Hofstadter Mark David
Muhleman Duane O.
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