Research field 1: Planetary atmospheres. Project 1.1: UV spectroscopy of the outer planets

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Iue, Jupiter (Planet), Neptune (Planet), Planetary Atmospheres, Saturn (Planet), Ultraviolet Spectroscopy, Uranus (Planet), Albedo, Fraunhofer Lines, Raman Spectra, Voyager Project

Scientific paper

The long term stability of the Lyman alpha emission of atomic hydrogen in the upper atmospheres of Jupiter, Neptune, Saturn and Uranus are investigated using the International Ultraviolet Explorer (IUE) satellite. Radiation transport calculations (taking into account Raman scattering) on Neptune and Uranus spectra show that the 'rest noise' in the spectral albedo is mainly due to Fraunhofer emission lines. The preliminary analysis of Neptune spectra shows no modulation of the albedo with the rotation of Neptune, within the accuracy of the measurements. The spots and band in the atmosphere of Neptune discovered by the Voyager camera probably do not extend into the pressure range probed by IUE.

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