Io: IUE observations of its atmosphere and the plasma torus

Details Io: IUE observations of its atmosphere and the plasma torus Io: IUE observations of its atmosphere and the plasma torus

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281a..79b&link_type=abstract

In ESA, A Decade of UV Astronomy with the IUE Satellite, Volume 1 p 79-83 (SEE N89-10682 01-89)

Astronomy and Astrophysics

Astronomy

Io, Iue, Satellite Atmospheres, Space Plasmas, Spaceborne Astronomy, Toruses, Ultraviolet Astronomy, Atmospheric Models, Plasma Diagnostics

Scientific paper

Two of the main components of the atmosphere of Io, neutral oxygen and sulfur, were detected with the IUE. Four observations yield brightnesses that are similar, regardless of whether the upstream or the downstream sides of the torus plasma flow around Io is observed. A simple model requires the emissions to be produced by the interaction of O and S columns in the exospheric range with 2 eV electrons. Cooling of the 5 eV torus electrons is required prior to their interaction with the atmosphere of Io. Inconsistencies in the characteristics of the spectra that cannot be accounted for in this model require further analysis with improved atomic data. The Io plasma torus was monitored with the IUE. The long-term stability of the warm torus is established. The observed brightnesses were analyzed using a model of the torus, and variations of less than 30 percent in the composition are observed, the quantitative results being model dependent.

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