Computer Science
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980icar...42..111t&link_type=abstract
Icarus, vol. 42, Apr. 1980, p. 111-124.
Computer Science
17
Ionized Gases, Jupiter Atmosphere, Planetary Composition, Sulfur, Asymmetry, Atmospheric Composition, Electron Density (Concentration), Electron Energy, Emission Spectra, Io, Line Spectra, Planetary Magnetic Fields, Tables (Data), Toruses, Jupiter, Toruses, Longitude, Asymmetry, Spectrum, Emissions, Sulfur, Clouds, Electrons, Temperatures, Density, Observations, Wavelengths, Data Reduction, Data, Magnetic Fields, Intensity, Latitude, Ionization, Gases, Ions, Satellites, Io, Models, Flux Tube, Current, Anoma
Scientific paper
The variations with Jovian magnetic longitude observed in the intensity of the S II emission from the plasma torus surrounding Jupiter near the orbit of Io are investigated. Spectrographic observations of S II emission from 2.1 to 8.3 Jupiter radii from the planet obtained from 1976 to 1979 were examined to determine emission intensities in relation to position. The detected emission is found to be sharply confined to a magnetic latitude within 12 deg of the equator and a region inside 6.7 Jupiter radii, just outside of Io's orbit, with maximum emission at a magnetic longitude of 260 deg. The region of maximum brightness is observed to include the active centers for the currents expected in the flux tubes connected with Io, support of the magnetic anomaly models of Dressler and Hill (1979). Electron temperatures between 10 to the 3.92 and 10 to the 4.80, and densities of 10 to the 4.2/cu cm and a S II column abundance of 1.5 x 10 to the 13th/sq cm are estimated for the brightness region near the ansa of the emission torus. An order of magnitude difference between S II column abundances obtained in the present investigation and found by Brown (1978) is attributed to a change in sulfur content, possibly related to Ionian volcanic activity, while electron temperatures and densities are found to remain fairly constant.
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