Modeling temporal variability of plasma conditions in the Io torus during the Cassini era

Details Modeling temporal variability of plasma conditions in the Io torus during the Cassini era Modeling temporal variability of plasma conditions in the Io torus during the Cassini era

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jgra..10910216d&link_type=abstract

Journal of Geophysical Research, Volume 109, Issue A10, CiteID A10216

Physics

10

Planetology: Solar System Objects: Jupiter, Planetology: Comets And Small Bodies: Composition, Planetology: Comets And Small Bodies: Interactions With Solar Wind Plasma And Fields, Planetology: Comets And Small Bodies: Ionospheres-Composition And Chemistry, Planetology: Comets And Small Bodies: Atmospheres-Composition And Chemistry

Scientific paper

Observations of ultraviolet (UV) emissions from the major ion species (S+, S++, S+++, O+, O++) of the Io plasma torus made during the Cassini flyby (October 2000 to March 2001) have revealed significant time variability. Using a homogeneous model for mass and energy flow in the torus parameterized by five input variables (transport timescale, neutral source strength, ratio of oxygen to sulfur atoms in the source, fraction of superthermal electrons, and temperature of the hot electrons), we have investigated the time variability of the torus properties (density, composition, and temperature) during the Cassini era. In order to match the changes in emissions, the model suggests that a significant change in the neutral source occurred near the beginning of the observing period, decreasing from >1.8 tons/s to 0.7 tons/s. The changes in the neutral source appear to coincide with the declining phase of a dramatic (i.e., 2-3 order of magnitude) peak in iogenic dust emissions observed by Galileo prior to the Cassini era.

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