The Voyager 1 EUV spectrum of the Io plasma torus

Details The Voyager 1 EUV spectrum of the Io plasma torus The Voyager 1 EUV spectrum of the Io plasma torus

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9179s&link_type=abstract

Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9179-9192.

Mathematics

Logic

74

Cosmic Plasma, Io, Plasma Spectra, Toroidal Plasmas, Ultraviolet Spectra, Voyager 1 Spacecraft, Collisional Plasmas, Electron Energy, Extreme Ultraviolet Radiation, High Temperature Plasmas, Line Spectra, Optical Thickness, Particle Collisions, Plasma Density, Plasma Temperature, Jupiter, Satellites, Io, Plasma Torus, Ultraviolet, Spectrum, Intensity, Voyager 1, Analysis, Models, Collisions, Electrons, Temperatures, Ions, Density, Plasmas, Comparisons, Spectroscopy, Observations, Morphology, Earth-Based Obs

Scientific paper

The Voyager 1 EUV spectrum of the hot Io plasma torus obtained before encounter in 1979 at a range of 4,800,000 km is analyzed in terms of a collisional model with improved collision strengths. Model calculations are based entirely on steady-state equilibrium between electron excitation-deactivation and radiative decay in the subspecies structure, and plasma temperature and species number densities are derived by fitting model spectra to the observations. Lines of S II, S III, S IV, O II, and O III are found to be dominant in the plasma torus, at torus half width densities of 44, 160, 220, 50, and 340/cu cm, respectively, and lines of S V and K III may also be present. An effective electron temperature of 80,000 K is estimated for the central dense region near 6 Jupiter radii. Model calculations are in substantial agreement with other spectroscopic observations of the hot torus; however, the observations exhibit strong morphological differences with recent ground-based observations of S II emission, and calculated ion densities differ from in situ Voyager 1 plasma science measurements.

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