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Low-energy charged particle environment at Jupiter - A first lookPreliminary results of measurements obtained by the low energy charged particle instrument on board the Voyager 1 spacecraft during its traversal of the Jovian magnetosphere are reported. The instrument consists of the low energy particle telescope and the low energy magnetospheric particle analyzer, designed to perform measurements in the inner and outer magnetosphere respectively. Ions and electrons comprising the Jovian magnetosphere were first detected at a distance of about 600 Jupiter radii from the planet, with the first bow shock crossing at 85.6 Jupiter radii. Upon crossing the magnetopause at about 67 Jupiter radii, the flows of electrons and ions were observed to change direction from away from the planet to the corotational direction. The hot plasma near the magnetosphere boundary is comprised predominantly of protons, sulfur and oxygen. Selective particle absorption near the Io flux tube indicates some form of particle deflection by Io. Fluxes in the outbound region were found to be enhanced from 90 to 160 deg longitude, and 5- and 10-hour low energy particle flux periodicities were observed.
Document ID
19790052450
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Krimigis, S. M.
(Kansas Univ. Lawrence, KS, United States)
Bostrom, C. O.
(Kansas Univ. Lawrence, KS, United States)
Keath, E. P.
(Kansas Univ. Lawrence, KS, United States)
Zwickl, R. D.
(Kansas Univ. Lawrence, KS, United States)
Carbary, J. F.
(Johns Hopkins University Applied Physics Laboratory, Laurel, Md., United States)
Armstrong, T. P.
(Kansas, University Lawrence, Kan., United States)
Axford, W. I.
(Max-Planck-Institut fuer Aeronomie Katlenburg, Germany)
Fan, C. Y.
(Arizona, University Tucson, Ariz., United States)
Gloeckler, G.
(Maryland, University College Park, Md., United States)
Lanzerotti, L. J.
(Bell Telephone Laboratories, Inc. Murray Hill, N.J., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Publication Information
Publication: Science
Volume: 204
Subject Category
Lunar And Planetary Exploration
Accession Number
79A36463
Funding Number(s)
CONTRACT_GRANT: NASA TASK I
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: N00024-78-C-5384
Distribution Limits
Public
Copyright
Other

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