Energetic electrons in the Jovian magnetosphere

Details Energetic electrons in the Jovian magnetosphere Energetic electrons in the Jovian magnetosphere

Feb 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81..617b&link_type=abstract

Journal of Geophysical Research, vol. 81, Feb. 1, 1976, p. 617-632. Navy-supported research;

Physics

8

Electron Energy, Jupiter Atmosphere, Magnetospheric Electron Density, Pioneer 10 Space Probe, Planetary Magnetospheres, Angular Distribution, Data Reduction, Distribution Functions, Energy Dissipation, Energy Spectra, Line Shape, Spectrum Analysis

Scientific paper

Results are reported for a detailed analysis of Pioneer 10 data on energetic particle species in the magnetodisk region of Jupiter's magnetosphere. It is shown that the observed counting rates in the magnetodisk (beyond 20 Jupiter radii) were caused primarily by electrons with energies exceeding 0.06 MeV. Absolute omnidirectional electron intensities in the magnetodisk are presented for five integral energy ranges, and a model electron differential energy spectrum is found to fit the intensities throughout most of the encounter trajectory. It is suggested that the observed spectral shape results from losses of high-energy electrons by pitch-angle scattering. Observed equatorial energy spectra are used to compute distribution functions for several values of the first adiabatic invariant, mu. The radial profiles of the functions are found to have maxima at about 50 Jupiter radii inbound as well as at about 90 radii outbound and to diminish strongly for lesser radii. The large decreases in density are shown to require strong losses, and resonant electron whistler-mode pitch-angle scattering is suggested as a loss mechanism.

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