Galileo Observations of Electron Beams in Jupiter's Magnetosphere and Their Relationship With Auroral Processes

Details Galileo Observations of Electron Beams in Jupiter's Magnetosphere and Their Relationship With Auroral Processes Galileo Observations of Electron Beams in Jupiter's Magnetosphere and Their Relationship With Auroral Processes

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsm11a..05p&link_type=abstract

American Geophysical Union, Spring Meeting 2004, abstract #SM11A-05

Physics

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2756 Planetary Magnetospheres (5443, 5737, 6030)

Scientific paper

It is now well established that Jupiter's main ring of auroral luminosity is magnetically conjugate to the equatorial plane of the magnetosphere at radial distances between about 20 and 30 RJ. It is widely believed that the main auroral ring is related to the breakdown of plasma corotation that occurs in the middle magnetosphere at about these same distances from Jupiter, but the mechanisms responsible for accelerating particles to the requisite energies for production of the emissions remain matters of speculation. Measurements from the plasma instrumentation (PLS) of the Galileo spacecraft exhibit evidence of electron beams in the plasma sheet at just those locations as are considered above. The energies, the intensities, and the angular distributions of the beams, as well as their locations, all are consistent with leakage of auroral electrons into the magnetosphere. The beams thus appear to be signatures of auroral processes and of the coupling of the magnetosphere to the ionosphere. In this presentation we discuss the properties of the beams and consider the implications of these observations for models of auroral processes.

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