Dawn-dusk electric field asymmetry of the Io plasma torus

Details Dawn-dusk electric field asymmetry of the Io plasma torus Dawn-dusk electric field asymmetry of the Io plasma torus

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..210b&link_type=abstract

Geophysical Research Letters, vol. 10, Mar. 1983, p. 210-213.

Physics

62

Electric Fields, Io, Particle Trajectories, Toroidal Plasmas, Charged Particles, Earth Magnetosphere, Electron Energy, Extreme Ultraviolet Radiation, Orbit Perturbation, Jupiter, Satellites, Electric Fields, Asymmetry, Plasma Torus, Flow, Convection, Corotation, Orbits, Charged Particles, Electrons, Data, Temperature, Ultraviolet, Intensity, Spectrometry, Magnetosphere, Perturbation, Calculations, Diagram, Patterns, Dynamics

Scientific paper

The effects of a combined convection and corotation electric field across the Io plasma torus are considered. A dawn-to-dusk electric field EC will modify the orbits of charged particles shifting them toward dawn. The radial drift imposed by the perturbed orbits implies a local time-dependent modulation of low-energy ion and electron temperatures with particles hotter at dusk than at dawn. With EC approximately 4 mV/m, the orbits near 6 Jupiter radii would be shifted by approximately 0.2 Jupiter radius. Then the electron temperature would be 20% higher at dust than at dawn, an effect which could explain the local time asymmetry of EUV intensity found by the Voyager ultraviolet spectrometer. The source of the convection electric field is internal to the magnetosphere, and is attributed to the tailward escape of Iogenic and Jovian plasma beyond the Alfven surface.

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