The far-ultraviolet spectra and geometric albedos of Jupiter and Saturn

Details The far-ultraviolet spectra and geometric albedos of Jupiter and Saturn The far-ultraviolet spectra and geometric albedos of Jupiter and Saturn

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..806c&link_type=abstract

Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 806-818.

Astronomy and Astrophysics

Astrophysics

33

Albedo, Iue, Jupiter (Planet), Planetary Radiation, Saturn (Planet), Ultraviolet Spectra, Atmospheric Models, Planets, Jupiter, Saturn, Ultraviolet, Wavelengths, Spectra, Albedo, Geometry, Photometry, Iue, International Ultraviolet Explorer, Ethene, Observations, Airglow, Emissions, Features, Absorption, Bands, Models, Atmosphere, Experiments, Mixing, Concentrations, Hydrocarbons, Flux, Comparisons, Abundance, Data, Acetylene, Ammonia, Ethane, Methane, Hydrogen

Scientific paper

Spectra and geometric albedoes in the range 1200 to 1940 A are compiled for Jupiter and Saturn on the basis of IUE observations. The spectra of both planets are dominated by H Lyman-alpha emission line at 1216 A, although absorption bands of C2H2 are apparent at longer wavelengths, particularly in the spectrum of Saturn, and the C I line at 1657 A is also observed. Geometric albedoes show emission features corresponding to the weak H2 Lyman and Werner bands around 1230-1280 A, auroral Lyman band emission, C I emission, and C2H2 absorption from 1600 to 1900 A. A model of atmospheric absorption in homogeneously mixed atmospheres of H2 and trace molecular absorbers is then presented and fit to the Jupiter albedo, resulting in a predicted atmosphere containing C2H2 and an unidentified molecular or particulate absorber. Finally, north-south maps of Jupiter continuum emission show limb darkening, and a comparison of equatorial and polar spectra indicates a polar increase in C2H2 absorption and weaker polar H2 emissions than previously reported.

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