A dawn-to-dusk electric field in the Jovian magnetosphere

Details A dawn-to-dusk electric field in the Jovian magnetosphere A dawn-to-dusk electric field in the Jovian magnetosphere

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32..179i&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, Feb. 1984, p. 179-185.

Physics

16

Birkeland Currents, Electric Fields, Io, Ionospheric Currents, Jupiter Atmosphere, Magnetospheric Electron Density, Planetary Magnetospheres, Satellite Atmospheres, Diurnal Variations, Field Aligned Currents, Planetary Ionospheres, Solar Terrestrial Interactions, Solar Wind

Scientific paper

It is shown that if Io-injected plasma is lost via a planetary wind a sun-fixed Birkeland current system may result. This is due to the fact that a current flows across a density gradient produced by the loss of plasma through the planetary wind in the tail. The divergent 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 a few mV/m. Independent estimates derived from the local time asymmetry of the torus u.v. emission indicate a field of 1.5 mV/m.

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