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Title:
Electron distributions in the inner Jovian magnetosphere: Voyager 1 observations
Authors:
YE, G.; ARMSTRONG, T. P.
Affiliation:
AAKansas Univ., Lawrence, KS, US ABKansas Univ., Lawrence, KS, US
Journal:
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A12, p. 21,253-21,264
Publication Date:
12/1993
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ELECTRON DISTRIBUTION, JUPITER (PLANET), PLANETARY MAGNETOSPHERES, SOLAR WIND, SPACEBORNE ASTRONOMY, TRANSPORT PROPERTIES, TRAPPED PARTICLES, ELECTRON PRECIPITATION, JUPITER ATMOSPHERE, PLANETARY IONOSPHERES, PLASMA DIFFUSION, VOYAGER 1 SPACECRAFT
Bibliographic Code:
1993JGR....9821253Y

Abstract

Using several improvements in the analysis of the observations of the Low Energy Charged Particle (LECP) experiment on Voyager 1, electron phase space densities in the inner Jovian magnetosphere (5 - 10 R(sub J) were first calculated at constant first and second invariants (represented by mu and K, respectively), based on the LECP measurements. The calculated electron phase space density profiles show that in the inner Jovian magnetosphere there exist evident time and longitude variations, energetic electron injections, and present radial transport and distributed losses. To study the radial and pitch angle diffusions of Jovian electrons, we have calculated the phase space densities in the K-L space. It is found that the electron population in the inner Jovian magnetosphere seems to consist of two components: electrons radially diffusing from a main external source and electrons generated from local sources. The radially diffusing electrons have a relatively time stationary and isotropic distribution, while the locally created electrons mainly concentrate around the equatorial plane and have relatively lower energies, in comparison with the inward diffusing electrons. Consequently, the sources of precipitation losses to the ionosphere must be primarily electrons transported from outer sources, and the major precipitations occur in the inner magnetosphere (L less than 7.5 R(sub J). In the inner Jovian magnetosphere (L = 5 to approximately 10 R(sub J)) it is estimated that for electrons with magnetic moment mu = 300 MeV/G, the diffusion coefficient D is roughly 10(exp -8) to approximately 10(exp -6) R(exp 2)(sub J)/s, and the lifetime against the diffusion losses is of the order of 10(exp 4) to approximately 10(exp 6) s.

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