Latitudinal oscillations of plasma within the Io torus

Details Latitudinal oscillations of plasma within the Io torus Latitudinal oscillations of plasma within the Io torus

May 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2108c&link_type=abstract

Journal of Geophysical Research, vol. 85, May 1, 1980, p. 2108-2114.

Astronomy and Astrophysics

Astronomy

12

Earth Magnetosphere, Io, Jupiter Atmosphere, Plasma Oscillations, Satellite Atmospheres, Toruses, Cold Plasmas, Electron Density (Concentration), High Temperature Plasmas, Magnetic Dipoles, Planetary Magnetic Fields, Plasma Equilibrium, Voyager Project, Jupiter, Satellites, Io, Toruses, Plasmas, Oscillations, Latitude, Magnetosphere, Mathematical Models, Sputtering, Ionization, Voyager 1, Radio Astronomy Experiment, Dynamics, Injection, Electrons, Density, Geometry, Dipole Moments, Magnetic Fields, Data, Co

Scientific paper

The equilibrium latitude and the period of oscillations about this equilibrium latitude are calculated for a plasma in a centrifugally dominated tilted dipole magnetic field representing Jupiter's inner magnetosphere. It is found that for a hot plasma the equilibrium latitude in the magnetic equator, for a cold plasma it is the centrifugal equator, and for a warm plasma it is somewhere in between. An illustrative model is adopted in which atoms are sputtered from the Jupiter-facing hemisphere of Io and escape Io's gravity to be subsequently ionized some distance from Io. Finally, it is shown that ionization generally does not occur at the equilibrium altitude, and that the resulting latitudinal oscillations provide an explanation for the irregularities in electron concentration within the torus, as reported by the radioastronomy experiment aboard Voyager I.

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