Magnetic drifts at Io - Depletion of 10-MeV electrons at Voyager 1 encounter due to a forbidden zone

Details Magnetic drifts at Io - Depletion of 10-MeV electrons at Voyager 1 encounter due to a forbidden zone Magnetic drifts at Io - Depletion of 10-MeV electrons at Voyager 1 encounter due to a forbidden zone

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.6137g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Aug. 1, 1983, p. 6137-6142.

Astronomy and Astrophysics

Astronomy

7

High Energy Electrons, Io, Particle Interactions, Planetary Magnetic Fields, Voyager 1 Spacecraft, Astronomical Models, Earth Magnetosphere, Particle Density (Concentration), Planetary Orbits, Spacecraft Trajectories, Jupiter, Satellites, Io, Magnetic Properties, Electrons, Voyager 1, Depletion, Convection, Velocity, Magnitude, Energy, Electric Fields, Pioneer, Comparisons, Protons, Mapping

Scientific paper

A model for magnetic field lines is used to track the Voyager spacecraft trajectory past Io back to the equatorial plane in order to determine the cause of an observed depletion of 10 MeV electrons in Io's orbit. The field lines are in the vicinity of an Alfven wing, a noncompressive field perturbation. It is suggested that the Jovian magnetospheric drift features influence the behavior of particles around Io, which also has a zone of reduced convection velocity. An analytical model is developed that demonstrates that a forbidden zone may exist around Io due to the gradient drifts and reduced convection velocity, and projections of particles convecting to the Io surface agree well with the Voyager data for particle concentrations. Discrepancies in the measured 9 MeV fluxes with respect to Pioneer data indicate that a possible change in the Io conductance in the interval between the passages of the two spacecraft.

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