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Ion and electron angular distributions in the Io torus region of the Jovian magnetosphereAngular distributions are presented of ion (about 0.5-2 MeV) and electron (greater than 10 MeV) fluxes measured during the Voyager 1 spacecraft passage through the inner regions of the Jovian magnetosphere. In the regions of peak flux intensities, just outside the orbit of Io, the ion angular distributions are most sharply peaked at 90 deg local pitch angle, a configuration consistent with diffusion of the particles inward from large radial distances. Inside the orbit of Io the lower-energy ions exhibit angular distributions depleted at 90 deg local pitch angles, suggesting the possibility of charge-exchange scattering loss of these particles. In the vicinity of the Io flux tube, no significant effect is observed in the flux or pitch angle distributions of the ions. The relativistic electrons are depleted in the flux tube region and exhibit an asymmetrical pitch angle distribution, with more electrons appearing to arrive from the equatorial region (the direction of Io) than from the low-altitude mirror point.
Document ID
19820028815
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lanzerotti, L. J.
(Bell Telephone Labs., Inc. Murray Hill, NJ, United States)
Maclennan, C. G.
(Bell Telephone Laboratories, Inc. Murray Hill, NJ, United States)
Armstrong, T. P.
(Kansas, University Lawrence, KS, United States)
Krimigis, S. M.
(Johns Hopkins University Laurel, MD, United States)
Lepping, R. P.
(Bell Telephone Labs., Inc. Murray Hill, NJ, United States)
Ness, N. F.
(NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, MD, United States)
Date Acquired
August 10, 2013
Publication Date
September 30, 1981
Publication Information
Publication: Journal of Geophysical Research
Volume: 86
Subject Category
Lunar And Planetary Exploration
Accession Number
82A12350
Funding Number(s)
CONTRACT_GRANT: NASA TASK I
CONTRACT_GRANT: N00024-78-C-5384
Distribution Limits
Public
Copyright
Other

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