Galileo Energetic Particles Detector measurements of hot ions in the neutral sheet region of Jupiter's magnetodisk

Details Galileo Energetic Particles Detector measurements of hot ions in the neutral sheet region of Jupiter's magnetodisk Galileo Energetic Particles Detector measurements of hot ions in the neutral sheet region of Jupiter's magnetodisk

Jan 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26....5k&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 1, p. 5-8

Physics

10

Magnetospheric Physics: Planetary Magnetospheres

Scientific paper

Hot ions discriminated by mass, look direction, and energy have been detected by the Energetic Particles Detector (EPD) on the Galileo spacecraft in the Jovian magnetosphere. Using techniques adapted from analysis of Voyager ion measurements, EPD data have been fitted to a three-species convected κ distribution function using a nonlinear least squares technique. The ion species were assumed to be sulfur, oxygen, and protons of arbitrary charge. The bulk flow speed of ions in the neutral sheet region of Jupiter's magnetodisk deduced from the model was found to increase slightly with increasing radial distance from Jupiter within a 20-60 RJ region near local midnight. The resulting flow speed of ~0.5 times the rigid corotation speed beyond 30 RJ is similar to that found from analysis of Voyager measurements. The behavior of protons, sulfur, and oxygen is consistent with adiabatic cooling (T/B=constant) with increasing radial distance in the region analyzed. The distribution functions are similar to those derived from Voyager measurements, with sulfur contributing the largest component of the total hot ion pressure.

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