HR: 1330h
AN: SM22B-0254    [PDF]
TI: Excitation of whistler-mode waves and resonant electron scattering in the Jovian magnetosphere
AU: * Bhattacharya, B
EM: bhattach@ipac.caltech.edu
AF: SIRTF Science Center, MS 220-6 1200 E. California Blvd, Pasadena, CA 91125 United States
AU: Thorne, R M
EM: rmt@atmos.ucla.edu
AF: Dept. Atmos. Sciences, UCLA, 7127 MS, Box 951565 405 Hilgard Avenue, Los Angeles, CA 90095 United States
AU: Kurth, W S
EM: william-kurth@uiowa.edu
AF: Dept. Physics & Astronomy, Univ. of Iowa, 203 Van Allen Hall, Iowa City, IA 52242-1479 United States
AU: Gurnett, D A
EM: dag@space.physics.uiowa.edu
AF: Dept. Physics & Astronomy, Univ. of Iowa, 203 Van Allen Hall, Iowa City, IA 52242-1479 United States
AU: Williams, D J
EM: Don.Williams@jhuapl.edu
AF: Applied Physics Lab, JHU, 11100 Johns Hopkins Road, Laurel, MD 20723-6099 United States
AB: 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 R$_J$ 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 10$^2$ V$^2$ 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' $\sim$ 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.
DE: 2704 Auroral phenomena (2407)
DE: 2716 Energetic particles, precipitating
DE: 2756 Planetary magnetospheres (5443, 5737, 6030)
DE: 2772 Plasma waves and instabilities
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting