Ultraviolet observations of the Io torus from the IUE observatory

Astronomy and Astrophysics – Astrophysics

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Abundance, Io, Iue, Jupiter Atmosphere, Satellite Atmospheres, Satellite Observation, Ultraviolet Spectroscopy, Earth Magnetosphere, Heavy Elements, Line Spectra, Neutral Particles, Oxygen, Sulfur

Scientific paper

The short wavelength spectrograph on the International Ultraviolet Explorer (IUE) has been used to obtain 11 A resolution spectra of the Io torus from 1175-1950 A. The four spectra, obtained in the springs of 1979 and 1980, show emissions (about 40R) of S II A1256A and S III A1199A. An unidentified feature is also present at 1729 A; a tentative identification as an intercombination line of S III is proposed. Weak features, probably due to O III A1664A and S IV A1406A, appear in some of the spectra. Abundances of the ions are determined from the brightnesses of the observed features. Upper limits are also set for the abundances of a number of ionic and neutral species. An observation of Io itself does not show any additional or enhanced spectral features, permitting upper limits to be set on the injection rate for a number of species.

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