Pioneer 11 observations of trapped particle absorption by Amalthea

Details Pioneer 11 observations of trapped particle absorption by Amalthea Pioneer 11 observations of trapped particle absorption by Amalthea

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88...36m&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 36-44.

Physics

9

Amalthea, Diffusion Coefficient, Particle Diffusion, Planetary Magnetic Fields, Trapped Particles, Earth Magnetosphere, High Energy Electrons, Pioneer 11 Space Probe, Protons, Jupiter, Satellites, Amalthea, Pioneer 11, Observations, Particles, Absorption, Entrapment, Low Energy Particles, Flux, Diffusion, Equipment, Diagrams, Analysis, Models, Magnetic Fields, Shadows, Energy, Intensity, Heavy Nuclei, Electrons, Comparisons, Data

Scientific paper

The discovery of a microsignatury of trapped radiation in the Amalthea orbit as detected by Pioneer 11 in a flyby of Juptier in 1974 is reported and its implications for the radial diffusion coefficient in Jupiter's inner magnetosphere are discussed. A low energy telescope registered the absorption of low-energy protons as a function of the magnetic L shell durig inbound and outbound trajectories. Drift velocities of the 1 MeV particles were calculated. No correspondingly heightened effects were observed from high-energy electrons or heavier nuclei. Further analysis of the 0.5-8.7 MeV protons showed data to be consistent erosion of the particle drift shadows by a diffusion process. A limit was calculated for the highest diffusion coefficient value for the 1 MeV protons at the Amalthea orbit. The results indicate that the diffusion is driven by fluctuating electric or magnetic fields.

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