Determination of ionic abundances in the Io torus using the Hopkins Ultraviolet Telescope

Details Determination of ionic abundances in the Io torus using the Hopkins Ultraviolet Telescope Determination of ionic abundances in the Io torus using the Hopkins Ultraviolet Telescope

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382l.105m&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. L105-L108.

Astronomy and Astrophysics

Astronomy

49

Abundance, Io, Space Plasmas, Ultraviolet Astronomy, Ultraviolet Telescopes, Astro Missions (Sts), Oxygen Ions, Planetary Magnetospheres, Sulfur

Scientific paper

Attention is given to a 415-1864-A spectrum of the emissions from the Io torus with about 3-A resolution in first order (830-1864 A) obtained with HUT in December 1990. A list of the 31 strongest features shows that, apart from five features that are totally or partially terrestrial, all are due to O(+), S(+), S(2+), and S(3+). There is no evidence for elements other than oxygen and sulfur. The spectrum shows many additional weaker emission features so that the existence of minor species cannot be ruled out at this time. Because the HUT spectrum contains well-resolved lines for all four of the major species, the mixing ratio (Ni/ne) for each one can be determined without using models of the spectral emissions, or a detailed geometric model of the torus plasma. The relative concentration of O(+) determined from the HUT observation is 38 percent less than that obtained from the Voyager UVS data.

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