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Published June 1, 1979 | public
Journal Article

Voyager 1: Energetic Ions and Electrons in the Jovian Magnetosphere


The observations of the cosmic-ray subsystem have added significantly to our knowledge of Jupiter's magnetosphere. The most surprising result is the existence of energetic sulfur, sodium, and oxygen nuclei with energies above 7 megaelectron volts per nucleon which were found inside of Io's orbit. Also, significant fluxes of similarly energetic ions reflecting solar cosmic-ray composition were observed throughout the magnetosphere beyond 11 times the radius of Jupiter. It was also found that energetic protons are enhanced by 30 to 70 percent in the active hemisphere. Finally, the first observations were made of the magnetospheric tail in the dawn direction out to 160 Jupiter radii.

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© 1979 American Association for the Advancement of Science. Revision received 23 April 1979. We thank the Voyager Project and the enthusiastic staff of our laboratories at California Institute of Technology (Caltech) and Goddard Space Flight Center (GSFC) for splendid support. Special thanks go to W. Althouse (Caltech), W. Davis, H. Domchick, and D. Stilwell (GSFC), and E. Franzgrote (JPL), who had major responsibilities. Supported by NASA under contracts NAS 7-100 and NGR 05-002-160.

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