Excitation of whistler-mode waves and resonant electron scattering in the Jovian magnetosphere

Details Excitation of whistler-mode waves and resonant electron scattering in the Jovian magnetosphere Excitation of whistler-mode waves and resonant electron scattering in the Jovian magnetosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm22b0254b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM22B-0254

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2756 Planetary Magnetospheres (5443, 5737, 6030), 2772 Plasma Waves And Instabilities

Scientific paper

In-situ measurements from the Galileo spacecraft suggest that there is a direct association between enhanced electron fluxes and the presence of whistler-mode plasma waves. A detailed study is presented of a magnetospheric injection event that occurred on day 257 of 1999 at 7.6 RJ using concurrent measurements from the Galileo Energetic Particle Detector (EPD) and Plasma Wave Subsystem (PWS). Simultaneous enhancements are seen in both electron flux and plasma wave power spectral density. Electrons in the energy range 15keV to several hundred keV are enhanced by up to a factor of six over a of nine minute interval. During this period, the plasma waves in the frequency range of a few kHz appear to intensify by factor of up to 102 V2 m-2 Hz-1. The source for these waves may be the free energy associated with anisotropic distributions of injected electrons. At this radial distance, we find that B' ˜ 100 pT, which is sufficient for strong diffusion scattering. Pitch-angle distributions during the injection provide additional evidence of strong pitch-angle scattering, which may provide the mechanism for appreciable filling the atmospheric loss cone, leading to Jupiter's diffuse aurora.

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