ULYSSES radio occultation observations of the Io plasma torus during the Jupiter encounter

Details ULYSSES radio occultation observations of the Io plasma torus during the Jupiter encounter ULYSSES radio occultation observations of the Io plasma torus during the Jupiter encounter

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992sci...257.1531b&link_type=abstract

Science (ISSN 0036-8075), vol. 257, no. 5076, Sept. 11, 1992, p. 1531-1535. Research supported by DARA and DLR.

Other

15

Electron Density (Concentration), Io, Jupiter (Planet), Radio Occultation, Toroidal Plasmas, Ulysses Mission, Gas Injection, Plasma Temperature, Superhigh Frequencies, Ultrahigh Frequencies, Voyager Project

Scientific paper

Radio signals from Ulysses were used to probe the Io plasma torus (IPT) shortly after the spacecraft's closest approach to Jupiter. The frequencies of the two downlinks at S-band (2.3 gigahertz) and X-band (8.4 gigahertz) were recorded, differenced, and integrated in order to derive the columnar electron density of the IPT. The measurements agree qualitatively with contemporary models of the IPT based on Voyager data, but significant differences are apparent as well. The overall level of the IPT electron density is approximately the same as the prediction, implying that the amount of gas (or plasma) injected from Io is similar to that observed during the Voyager era. On the other hand, the IPT seems to be less extended out of the centrifugal equator, implying a smaller plasma temperature than predicted.

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