Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978icar...35...93p&link_type=abstract
Icarus, vol. 35, July 1978, p. 93-98.
Astronomy and Astrophysics
Astronomy
1
Astronomical Photometry, Emission Spectra, Limb Darkening, Methane, Planetary Atmospheres, Uranus (Planet), Atmospheric Composition, Atmospheric Models, Atmospheric Scattering, Electrophotometry, Graphs (Charts), Light Transmission, Radiative Heat Transfer, Vertical Distribution
Scientific paper
Measurements of limb brightening on the Uranus disk within the lambda 7300 A CH4 band are interpreted using an elementary inhomogeneous radiative transfer model to describe the atmosphere. A two layer model which consists of a finite, optically thin, region of conservatively scattering particles overlying a semi-infinite clear H2-CH4 atmosphere satisfactorily explains the observations. The maximum optical thickness of the upper layer appears to lie in the range 0.1 to 0.2. The CH4/H2 mixing ratio in the lower layer is larger than the corresponding solar value by a factor on the order of three or greater. The results are discussed briefly in terms of current models of the Uranus atmosphere.
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