A comparison of the Voyager 1 ultraviolet spectrometer and plasma science measurements of the Io plasma torus

Details A comparison of the Voyager 1 ultraviolet spectrometer and plasma science measurements of the Io plasma torus A comparison of the Voyager 1 ultraviolet spectrometer and plasma science measurements of the Io plasma torus

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10019541t&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A10, p. 19541-19550

Physics

15

Magnetospheric Physics: Planetary Magnetospheres, Planetology: Fluid Planets: Interactions With Particles And Fields, Planetology: Fluid Planets: Rings And Dust

Scientific paper

We have developed a sophisticated package (Colorado Io Torus Emissions Package, or CITEP) to simulate emissions from the Io plasma torus, and have used it to examine the consistency of Voyager in situ and remote observations. CITEP merges ion composition derived from the ultraviolet spectrometer line ratios with measurements of electron densities, electron temperatures, and ion temperatures obtained by the plasma science instrument. The program then predicts the brightness and morphology of torus EUV emissions. We find that the measured brightness is approximately 2 times larger than the model predicts. When scaled up by this factor, the morphology of the model radial emission profile is consistent with the data, but somewhat less sharply peaked at the ribbon location. We examine several possible causes for the brightness discrepancy such as calibration errors, measurement accuracy, inaccuracies of the model, and torus variability, but find no definitive cause. .

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