Observations of the UV spectrum of Saturn from 3200 A to 1400 A with the IUE

Physics

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Iue, Saturn Atmosphere, Ultraviolet Spectra, Acetylene, Albedo, Atmospheric Models, Ethylene, Ultraviolet Absorption, Ultraviolet Reflection

Scientific paper

Spectra of Saturn have been acquired with the IUE satellite for the 1400 A to 3200 A wavelength range with, at less than 10 A, a higher resolution than was previously available. These spectra show the UV reflectivity of Saturn to be highly structured, with both resolved and large-scale absorption features. Model atmospheres constructed for comparison with these spectra included a wavelength-dependent UV absorber and the gases PH3, CH4, C2H6, C2H2 and C2H4. Acetylene is identified by a series of resolved absorptions from 1700 A to 1850 A, whereas absorptions from 1700 A to 1610 A may be attributable to ethylene. The IUE spectra provide constraints on the vertical distribution of the atmospheric constituents above the 200 mbar level.

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