Physics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.8513a&link_type=abstract
Journal of Geophysical Research, vol. 86, Sept. 30, 1981, p. 8513-8521. Research supported by the Bundesministerium für Forschu
Physics
109
Io, Magnetohydrodynamic Waves, Planetary Magnetic Fields, Plasma Currents, Satellite Atmospheres, Voyager 1 Spacecraft, Electrodynamics, Equatorial Atmosphere, Field Aligned Currents, Jupiter (Planet), Particle Mass, Plasma Density, Standing Waves, Jupiter, Voyager 1, Observations, Satellites, Io, Currents, Dipole, Alfven Waves, Emissions, Decameter Waves, Theoretical Studies, Models, Electrodynamics, Interactions, Corotation, Magnetosphere, Ionosphere, Perturbations, Magnetic Fields, Radiation, Mass, Densi
Scientific paper
The enigmatic control of the occurrence frequency of Jupiter's decametric emissions by the satellite Io has been explained theoretically on the basis of its strong electrodynamic interaction with the corotating Jovian magnetosphere leading to field-aligned currents connecting Io with the Jovian ionosphere. Direct measurements of the perturbation magnetic fields due to this current system were obtained by the Goddard Space Flight Center magnetic field experiment on Voyager 1 on March 5, 1979, when it passed within 20,500 km south of Io. An interpretation in the framework of Alfven waves radiated by Io leads to current estimates of 2.8 x 10 to the 6th A. A mass density of 7400-13,600 proton mass units/cu cm is derived, which compares very favorably with independent observations of the torus composition characterized by 7-9 proton mass units per electron for a local electron density of 1050-1500/cu cm. The power dissipated in the current system may be important for heating the Io heavy ion torus, inner magnetosphere, Jovian ionosphere, and possibly the ionosphere or even the interior of Io.
Acuña Mario Humberto
Ness Norman F.
Neubauer Fritz Manfred
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