Physics
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2131t&link_type=abstract
Geophysical Research Letters, vol. 24, p. 2131
Physics
41
Electromagnetic Radiation, Galileo Spacecraft, Low Frequencies, Plasmas (Physics), Toroidal Plasmas, Extraterrestrial Environments, Plasma Density, Magnetic Effects, Space Probes
Scientific paper
Anomalous plasma signatures were detected by the Galileo particles and fields instruments during the initial transit through the Io torus. These unusual events are characterized by abrupt changes in the magnetic field, enhanced levels of broadband low frequency electromagnetic waves and a pronounced change in both the flux and pitch angle anisotropy of energetic particles. Here we present a coordinated study of one of the events which occurred near 6.03 RJ just after 17:34 UT on December 7, 1995. The available data are consistent with the concept of rapid inward transport, and this is interpreted as the first evidence for the predicted interchange motions in the region exterior to the orbit of Io. Theoretical arguments indicate that the interchanging flux tube is characterized by substantially reduced plasma density, a spatial scale comparable to 103 km, and an inward radial velocity comparable to 102 km/s.
Armstrong Thomas P.
Bolton James S.
Galland Kivelson Margaret
Gurnett Donald A.
Mansergh Thorne Richard
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