Pionener 11 observations of effects of Ganymede and Callisto on Jupiter's trapped radiation

Details Pionener 11 observations of effects of Ganymede and Callisto on Jupiter's trapped radiation Pionener 11 observations of effects of Ganymede and Callisto on Jupiter's trapped radiation

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9110975m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 10975-10988.

Physics

3

Callisto, Ganymede, Jupiter (Planet), Magnetically Trapped Particles, Planetary Radiation, Current Sheets, Flyby Missions, Lines Of Force, Magnetic Field Configurations, Pioneer 11 Space Probe, Planetary Magnetic Fields

Scientific paper

Beyond about 10 RJ from Jupiter the configuration of magnetic field lines in Jupiter's magnetosphere is strongly affected by the presence of an equatorial current sheet. Using a Voyager 1 magnetic field model that explicitly includes the effects of this current sheet to describe the magnetic field line geometry, the authors have reexamined charged particle observations from Pioneer 11's high-latitude flyby of Jupiter in 1974. They find that if the trajectory of Pioneer 11 is mapped to the equatorial plane along the model magnetic field lines, significant features in the time-intensity profiles of trapped protons and electrons, including one microsignaturelike feature, are found to correspond to shells of closed field lines crossed by the orbits of the satellites Ganymede and Callisto. Although many of the characteristics of the features, including their magnitude, persistence, and similarity of appearance for protons and electrons, are difficult to explain, the authors suggest that these features are signatures of interaction of the trapped particles with Ganymede and Callisto.

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