Detection of the Io plasma torus by Pioneer 10

Details Detection of the Io plasma torus by Pioneer 10 Detection of the Io plasma torus by Pioneer 10

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..409i&link_type=abstract

Geophysical Research Letters, vol. 8, Apr. 1981, p. 409-412.

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Io, Ion Motion, Jupiter Atmosphere, Toroidal Plasmas, Helium Ions, Oxygen Ions, Pioneer 10 Space Probe, Plasma Diagnostics, Sulfur, Jupiter, Satellites, Io, Plasmas, Toruses, Pioneer 10, Data, Energy, Ions, Corotation, Sulfur, Oxygen, Comparisons, Temperatures, Analysis, Magnetosphere, Radiation, Observations, Spectrum, Density

Scientific paper

Evidence of corotating ions which appear to be primarily S(++) has been discovered in data from the Pioneer 10 plasma analyzer, recorded as the spacecraft moved inward from 6.9 to 5.4 Jupiter radii, during its encounter with Jupiter in 1973. H(+) or He(++) ions or other light ions are also observed during this time. The Pioneer 10 plasma profile shows a relative variation with radial distance remarkably similar to the Voyager density profile. Both show a well-defined peak falling off steeply toward Jupiter and gradually decreasing away from Jupiter. The Pioneer 10 plasma data are also consistent with a constant temperature plasma for at least 0.5 Jupiter radii outside Io's orbit. A radially inward deflection from strict corotation is also evident in the data. A detailed analysis of the Pioneer 10 plasma instrument's behavior and data in the inner Jovian magnetosphere indicates that the above results are not seriously distorted by radiation background. The previous study of Pioneer 10 data of the inner Jovian magnetosphere (Frank et al., 1976) did not include the particular telemetered values from which the detection of these ions has been inferred.

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