The Jovian spectrum in the region 0.4-1.1 microns - The C/H ratio

Details The Jovian spectrum in the region 0.4-1.1 microns - The C/H ratio The Jovian spectrum in the region 0.4-1.1 microns - The C/H ratio

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978rvgsp..16..289w&link_type=abstract

Reviews of Geophysics and Space Physics, vol. 16, Aug. 1978, p. 289-319.

Physics

Space Physics

17

Hydrogen, Infrared Absorption, Jupiter Atmosphere, Methane, Molecular Absorption, Planetary Radiation, Absorption Spectra, Atmospheric Models, Mass Ratios, Quadrupoles, Radiative Transfer, Photometry, Jupiter, Absorption, Carbon, Hydrogen, Models, Spectroscopy, Absorption Spectra, Methane, Spectrum, Atmosphere, Clouds

Scientific paper

A review is presented of the interpretations of CH4 and H2 absorptions in the Jovian spectrum from about 0.4 to 1.1 microns, which provide the only direct source of information on the CH4/H2 ratio in the Jovian atmosphere. The point of view is that of an interpreter rather than of an observer. A historical review of the identification of the absorbers is followed by discussions of laboratory spectroscopy and the representation of such results by curves of growth and band models. Next are a survey of radiative-transfer methods and a discussion of the various representations of the Jovian atmosphere and cloud structure. Though the reflecting-layer model is popular, it is known to be at odds with observation, and conclusions based on it must be viewed with suspicion. The same is true of the homogeneous scattering model, though a seldom used combination (the reflecting-scattering model) has much to recommend it. Various versions of two-cloud models have been used; their special problem is how to find enough data to pin down the multitude of parameters. Despite the various difficulties the best determinations of CH4/H2 have not been grossly disparate. A carbon enrichment on Jupiter of as much as a factor of 5-10 must be seriously considered.

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