Hot ion Distributions and Anisotropies in the Outer Magnetospheres of Jupiter and Saturn

Details Hot ion Distributions and Anisotropies in the Outer Magnetospheres of Jupiter and Saturn Hot ion Distributions and Anisotropies in the Outer Magnetospheres of Jupiter and Saturn

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm52a..03k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM52A-03

Physics

2731 Magnetosphere: Outer, 2756 Planetary Magnetospheres (5443, 5737, 6033)

Scientific paper

The Voyager and Galileo spacecraft detected convecting hot ions in the outer magnetosphere of Jupiter. Both spacecraft revealed a co-rotation dominated plasma disk containing a mixture of light (hydrogen) and heavy (sulfur, oxygen) ions, with the heavy ions contributing the bulk of the pressure. The equatorial outer magnetosphere of Jupiter was in a state of partial co-rotation, with temporal and local time variations apparent. Radial profiles indicate increasing (sub)co-rotation to a distance beyond which the profiles cease their increase. After exiting the magnetodisk region, Voyager 2 traversed a transitional region before finally encountering the dawn magnetopause at a distance of ~170 Jupiter radii and beyond, whereupon it entered a region filled with heavy ion dominated magnetospheric plasma. At Saturn, the Voyager and Cassini spacecraft have measured intensities of hot hydrogen and oxygen ions in the outer magnetosphere. We find that the ion anisotropies in the outer magnetosphere are frequently convective in nature. Analysis of night side ion populations reveals plasma capable of nearly rigid co-rotation within the orbit of Titan, but beyond this distance, we find increasing departure from rigid co-rotation. We find striking similarities in the overall morphology of these systems. We present a comparative analysis of the dynamics of hot ions in the night side outer regions of the magnetospheres of Jupiter and Saturn using a synthesis of our multi-spacecraft observations.

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