Other
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.3011b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 3011-3019.
Other
27
Flow Velocity, Io, Magnetohydrodynamic Flow, Space Plasmas, Electron Density (Concentration), Incompressible Flow, Plasma Density, Voyager 1 Spacecraft, Jupiter, Satellites, Plasma, Velocity, Flux Tube, Flow, Analysis, Spectra, Voyager 1, Spacecraft Observations, Plasma Science Instrument, Pls, Experiments, Density, Electrons, Pattern, Comparisons
Scientific paper
Data obtained with the Voyager Plasma Science Experiment (PSE) during a flyby of the Jovian moon Io are analyzed to quantify the bulk plasma parameters near the Io flux tube. The PSE contains four modulated grid Faraday cups, three pentagonally shaped and the other circular. The path of the spacecraft around Jupiter and past Io ensured that the maximum flux was passing perpendicular to the spacecraft instruments when Voyager was closest to Io (20,000 km). A total of 11 high resolution (M mode) plasma spectra were obtained, revealing 6 species of ions: H(+), O(+), O(2+), S(+), S(2+) and S(3+). All species had the same bulk velocity and convected maxwellian distributions; the heavy ions species were all the same temperature. The mass density of the plasma near Io was 20,000-25,000 amu/cu cm and the electron density was 1300-1700/cu cm. Calculations of the Alfven speed yielded a value ranging from 250-350 km/sec and an Alfven Mach no. of 0.17-0.21. The data were equivalent to that expected from the flow of an incompressible fluid around a long cylinder with a radius about 1.25 that of Io's.
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