Physics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8418136g&link_type=abstract
Unknown
Physics
Birkeland Currents, Diurnal Variations, Electric Fields, Io, Jupiter Atmosphere, Planetary Magnetospheres, Sunrise, Sunset, Electric Current, Field Aligned Currents, Planetary Ionospheres, Planetary Magnetic Fields, Solar Wind, Space Plasmas
Scientific paper
It is shown that if Io-injected plasma is lost via a planetary wind-fixed Birkeland current system may result. This is due to the fact that the azimuthal centrifugal current flows across a density gradient produced by the loss of plasma through the planetary wind in the tail. The divergent centrifugal current is connected to field-aligned Birkeland currents which flow into the ionosphere at dawn and out of it at dusk. The closure currents in the ionosphere require a dawn to dusk electric field which at the orbit of Io is estimated to have a strength of 0.2 mV/m. However, the values of crucial parameters are not well known and the field at Io's orbit may well be significantly larger. Independent estimates derived from the local time asymmetry of the torus UV emission indicate a field of 1.5 mV/m.
Goertz Christoph K.
Ip W. I.
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