Long-term stability of the Io high-temperature plasma torus

Details Long-term stability of the Io high-temperature plasma torus Long-term stability of the Io high-temperature plasma torus

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..369m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 369-382.

Astronomy and Astrophysics

Astrophysics

42

High Temperature Plasmas, Io, Space Plasmas, Toroidal Plasmas, Ultraviolet Spectra, Brightness, Electron Density (Concentration), Electron Energy, Emission Spectra, Forbidden Transitions, Iue, Plasma Density, Sulfur, Three Dimensional Models, Jupiter, Satellites, Io, Thermal Effects, Temperature, Plasma, Torus, Iue, International Ultraviolet Explorer, Observations, Mixing, Electrons, Brightness, Geometry, Models, Ions, Density, Voyager 1, Parameters, Ionization, Ultraviolet, Wavelengths, Spectra

Scientific paper

The IUE satellite was used to monitor the UV line emission of S+, S++ and S+++ ions in the high-temperature portion of the Io plasma torus. Thirteen observations obtained over a 5 yr period from 1979 March to 1984 March show that the plasma parameters of the high-temperature portion of the torus have surprisingly small variations. In particular, the mixing ratio for the dominant constituent, S++, and the electron temperature are quite stable. To correct for the geometric effects, a simple three-dimensional model of the plasma torus is used to obtain the ion mixing ratios and the plasma density for each observation. The long-term variations of the mixing ratios and the plasma density are presented and a comparison of the measured ionization balance with that predicted by the effects of ionization, recombination, and the plasma confinement time is given.

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