Electron Flux Variability and Diffuse Auroral Precipitation in the Jovian Magnetosphere

Details Electron Flux Variability and Diffuse Auroral Precipitation in the Jovian Magnetosphere Electron Flux Variability and Diffuse Auroral Precipitation in the Jovian Magnetosphere

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11d..05b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11D-05

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2772 Plasma Waves And Instabilities, 5440 Magnetic Fields And Magnetism, 5737 Magnetospheres (2756)

Scientific paper

The energetic electron population in the middle Jovian magnetosphere is subject to pronounced, episodic flux enhancements. A study has been made of the effects of such electron injections into the Jovian magnetosphere and of their ability to provide the source population for variations in diffuse auroral emissions. To identify the source region of precipitating auroral electrons, we have investigated the pitch-angle distributions of high-resolution Galileo Energetic Particle Detector (EPD) data that indicate strong flux levels near the loss cone. The equatorial source region of precipitating electrons has been extrapolated from the locations of Galileo's in-situ measurements by tracing magnetic field lines using the KK97 model. The primary source region for Jupiter's diffuse aurora appears to lie in the magnetic equator at 15 - 40 RJ, with the predominant contribution to precipitation flux (tens of ergs-cm-2-s-1-sr-1) stemming from < 30 RJ. The average diffuse auroral precipitation flux has been shown to vary by as much as a factor of eight at a given radial location. This variability appears to be associated with electron injection events that have been identified in high-resolution Galileo Energetic Particle Detector data. These electron flux enhancements are also associated with enhanced whistler-mode waves that cause pitch-angle scattering and isotropization through resonant wave-particle interactions.

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