Interchange Injection and Drift Dispersion of Hot Plasma in Saturn's Magnetosphere

Details Interchange Injection and Drift Dispersion of Hot Plasma in Saturn's Magnetosphere Interchange Injection and Drift Dispersion of Hot Plasma in Saturn's Magnetosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p53b..07h&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #P53B-07

Physics

5443 Magnetospheres (2756), 5737 Magnetospheres (2756), 2720 Energetic Particles, Trapped, 2756 Planetary Magnetospheres (5443, 5737, 6030)

Scientific paper

During the first pass of the Cassini-Huygens spacecraft through Saturn's magnetosphere, the Cassini Plasma Spectrometer (CAPS) observed several intermittent occurrences of multi-keV ions and electrons superimposed on a cooler (10 - 100 eV) background plasma. These events are tentatively interpreted as signatures of centrifugally driven interchange motions that inject isolated flux tubes of hot tenuous plasma toward Saturn, similar to injection events reported at Jupiter by the Galileo spacecraft. Both ions and electrons show evidence of energy-time dispersion resulting from adiabatic (gradient-curvature) drift relative to the partially corotating plasma frame of reference. Rotation converts a longitude structure in the rotating frame into a temporal structure in the spacecraft frame. Ions (electrons) drift eastward (westward) relative to the rotating frame with a speed proportional to thermal energy. Thus ions (electrons) display a negative (positive) slope in an energy-time spectrogram. The magnitude of the slope is a measure of the elapsed time since injection. Such events are observed both inbound and outbound in a radial range L = 6 - 10, and are frequently associated with narrow but deep density cavities in the cooler background plasma.

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