Long term variability of the IO torus

Details Long term variability of the IO torus Long term variability of the IO torus

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..500m&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 500 (SEE N85-20961 11-89

Astronomy and Astrophysics

Astronomy

Emission Spectra, Io, Spectral Emission, Toroidal Plasmas, Ultraviolet Spectra, Variability, Astronomical Models, Electron Energy, Iue, Plasma Density

Scientific paper

It is now possible to estimate the long term variation of the S(+), S(++), and (to a lesser extent) S(+++) concentrations in the high electron temperature core plasma of the Io torus. The effects of the viewing geometry and the rocking of the torus about the centrifugal axis were modeled using (1) the plasma density and electron temperature profiles previously derived from Voyager data by others; (2) the assumption that an ion mixing ratio was the same throughout the torus; and (3) local charge neutrality. This procedure was checked by using a crude spatial scan consisting of three five-hour observations obtained back to back at elongations of 5.0, 6.0, and 7.0 RJ. The S(+), and S(++) and a smaller number of S(+++) concentrations are presented for thirteen observations from 1979 March 1 to 1984 March 21. Significant variations in the plasma density have clearly occurred.

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