Auroral Electron Beams in the Jovian Magnetosphere

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2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions, 2756 Planetary Magnetospheres (5443, 5737, 6030)

Scientific paper

Bi-directional, field-aligned streams of hot electrons are detected with the plasma instrumentation of the Galileo spacecraft in Jupiter's magnetosphere in three different regions; (1) inside the Io flux tube where the thermal ions are hung-up with respect to the moon due to the high conductivity there, (2) in the plasma torus during flux-tube interchange events associated with radial transport of Iogenic plasma, and (3) in the plasma sheet at radial distances from Jupiter beyond about 20 Jovian radii, which is also a region where plasma flow velocities largely depart from those for rigid corotation. The energies of the electrons extend to several tens of keV and intensities are sufficient for production of auroral emissions. Similarities in the characteristics of the electron beams and the associations with non-corotation of the thermal plasmas are common features that link these observations from otherwise disparate regions and suggest the possibility of a common physical cause for the beams. In this presentation we exhibit evidence of the beams and their environs and discuss possible sources, with emphasis on the beams near and beyond 20 RJ that are magnetically conjugate to Jupiter's main rings of auroral luminosity.

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