Longitudinal asymmetry in the Io plasma torus

Details Longitudinal asymmetry in the Io plasma torus Longitudinal asymmetry in the Io plasma torus

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.3005c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, May 1, 1984, p. 3005-3010.

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9

Asymmetry, Io, Plasma Density, Satellite Atmospheres, Jupiter Atmosphere, Longitude, Toruses, Ultraviolet Spectra, Voyager 1 Spacecraft, Jupiter, Satellites, Io, Plasma, Torus, Asymmetry, Longitude, Ions, Voyager 1, Low Energy Charged Particle Instrument, Lecp, Phases, Density, Magnitude, Electrons, Energy, Radius, Comparisons, Electric Fields, Convection, Corotation, Flow, Velocity, Magnetic Effects, Anomalies, Models, Charged Particles, Magnetosphere

Scientific paper

A clear inbound-outbound asymmetry is found in Voyager 1 low-energy charged particle (LECP) phase space densities near 6 Jupiter radii. The asymmetry is of the same sign and comparable magnitude for electrons and ions at several different energies. Ion phase space density profiles at three values of the first invariant are uniformly displaced to larger radius by 0.25 Jupiter radii during the inbound pass. Inbound-outbound asymmetries which are very similar for electrons and ions at many different energies can be accounted for naturally by a convection electric field in the plasma torus. If the asymmetry is attributed to a convection field fixed in local time, then the field has a component of 4 mV/m pointing toward 0120 LT, roughly orthogonal to the dawn-dusk electric field proposed to account for local time asymmetry in the plasma torus. On the other hand, the asymmetry can be attributed to a corotating convection field, such that plasma outflow occurs within lambda(III) = 170-300 deg at a velocity of 2 x 10 to the -6th Jupiter radii per second near L = 6. In this case the LECP observations would be consistent with the magnetic anomaly model.

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