Uranus' (3-0) H2 quadrupole line profiles

Astronomy and Astrophysics – Astronomy

Scientific paper

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H Lines, Line Shape, Quadrupoles, Uranus Atmosphere, Astronomical Models, Methane, Planetary Temperature, Pressure Distribution, Uranus, Spectrometry, Spectra, Emissions, Models, Structure, Analysis, Temperature, Pressure, Optical Properties, Absorption, Haze, Depth, Scattering, Particles, Albedo, Altitude, Layers, Telescope Methods, Earth-Based Observations, Hydrogen, Wavelengths, Water, Methane, Reflectivity, Comparisons, Spacecraft Observations, Voyager 2

Scientific paper

Spectra of Uranus' S3(0) and S3(1) H2 quadrupole lines, obtained during the 1978-1980 apparitions, are analyzed, and are found to require the presence of a deep cloud. Modifications of the Baines and Bergstralh (1986) standard model, including an additional haze layer above the 16-km-am H2 level which contains strongly absorbing particles, are needed to fit the observations. For a Rayleigh phase function, such a haze (uniformly mixed with the gas above this level) would have an absorption optical depth of 0.16 and a single scattering particle albedo of 0.30. This modification would imply a fraction of normal H2 equal to 0.25 + or - 0.10, in agreement with the Baines and Bergstralh standard model.

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