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Voyager 2: Energetic Ions and Electrons in the Jovian Magnetosphere

Vogt, R. E. and Cummings, A. C. and Garrard, T. L. and Gehrels, N. and Stone, E. C. and Trainor, J. H. and Schardt, A. W. and Conlon, T. F. and McDonald, F. B. (1979) Voyager 2: Energetic Ions and Electrons in the Jovian Magnetosphere. Science, 206 (4421). pp. 984-987. ISSN 0036-8075.

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Abstract. The Voyager 2 encounter has enhanced our understanding of earlier results and provided measurements beyond 160 Jupiter radii (RJ) in the magnetotail. Significant fluxes of energetic sulfur and oxygen nuclei (4 to 15 million electron volts per nucleon) of Jovian origin were observed inside 25R^j, and the gradient in phase space density at 12 R^J indicates that the ions are diffusing inward. A substantially longer time delay versus distance was found for proton flux maxima in the active hemisphere in the magnetotail at Jovicentric longitudes Am = 260° to 320° than in the inactive hemisphere at Am = 85° to 110°. These delays can be related to the radial motion of plasma expanding into the magnetotail, and differences in the expansion speeds between the active and inactive hemispheres can produce rarefaction regions in trapped particles. It is suggested that the JO-hour modulation of interplanetary Jovian electrons may be associated with the arrival at the dawn magnetopause of a rarefaction region each planetary rotation.

Item Type:Article
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Cummings, A. C.0000-0002-3840-7696
Stone, E. C.0000-0002-2010-5462
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Additional Information:Copyright © 1979 AAAS. We thank the Voyager Project and the enthusiastic staff of our laboratories at the California Institute of Technology (Caltech) and the Goddard Space Flight Center (GSFC) for splendid support. Special thanks go to W. Althouse and J. Povlis (Caltech), J. Broomhall and J. Zipse of Computer Sciences Corporation, W. Davis, H. Domchick, and D. Stilwell (GSFC), and E. Franzgrote (Jet Propulsion Laboratory) who had major responsibilities. The team was greatly assisted in the near-real-time data analysis by the following Caltech undergraduates: T. Cowan, J. Ennis, D. Gordon, H. King, and especially T. Van Eck who wrote several special computer programs. Supported by NASA under contracts NAS 7-100 and NOR 05-002-160. Space Radiation Laboratory SRL ID #: 1979-10
Group:Space Radiation Laboratory
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NASANOR 05-002-160
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1979-10
Issue or Number:4421
Record Number:CaltechAUTHORS:20140417-135117781
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45013
Deposited By: SWORD User
Deposited On:23 Apr 2014 16:43
Last Modified:20 Feb 2020 14:33

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