Galileo-measured depletion of near-Io hot ring current plasmas since the Voyager epoch

Details Galileo-measured depletion of near-Io hot ring current plasmas since the Voyager epoch Galileo-measured depletion of near-Io hot ring current plasmas since the Voyager epoch

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.4715m&link_type=abstract

Journal of Geophysical Research, vol. 103, p. 4715

Physics

15

Ion Distribution, Plasma Currents, Planetary Magnetospheres, Jupiter Atmosphere, Galileo Spacecraft, Voyager Project, Toruses, Radiation Detectors, Energetic Particles, High Temperature Plasmas, Neutral Gases

Scientific paper

The first mass-discriminated, hot ion distribution moments are determined for hot, more than 50-keV ions in Jupiter's inner magnetosphere at the outer edge of Io's plasma torus by using the Galileo energetic particle detector data. These hot plasmas were significantly depleted during the Galileo encounter in 1995 as compared with the Voyager epoch of 1979. The depletion of the hot ions is apparently caused by enhanced charge exchange losses of hot ions, perhaps associated with enhanced emissions of neutral gases from the volcanoes of Io. Such neutral gas enhancements could simultaneously explain increases in the densities of the cooler Io torus plasmas. The hot plasma changes may explain why radial transport interchange turbulence has been observed by Galileo in the Io torus regions, whereas such turbulence was not apparent during the Voyager encounters in 1979. The hot ion depletion could also play a role in explaining the apparent differences between the Jovian auroral configuration observed in recent years by the Hubble space telescope and ground observers and the configuration observed by Voyager. This possibility is much less certain, however.

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