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GEOPHYSICAL RESEARCH LETTERS, VOL. 7, NO. 6, PAGES 453–456, 1980

Ions of Jovian Origin Observed by Voyageri and 2 in Interplanetary Space

R. D. Zwickl

University of California, Los Alamos Scientific Laboratory, Los Alamos, NM 87545

S. M. Krimigis

Applied Physics Laboratory, The Johns Hopkins University, Laurel, MD 20810

T. P. Armstrong

Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66044

L. J. Lanzerotti

Bell Telephone Laboratories, 600 Mountain Avenue, Murray Hill, New Jersey 07974

Abstract

Burst-like and long-lived ion fluxes (E ≳ 30 keV) of Jovian origin have been observed in interplanetary space by the LECP instrument on the Voyager 1 and 2 spacecraft. Burst (few minute duration) events are observed at distances greater than 0.6 AU (1200 R_J) from Jupiter. These events are highly anisotropic and possess steep energy spectra, while long-lived (>8 hour duration) events have relatively steady fluxes at low energies, strong anisotropies that decay with time, and a variable high energy component. Both types of events usually display simultaneous onsets and sharp cutoffs for all energies, an excess of atomic number Z ≥ 6 particles compared to solar and interplanetary events, and particle flow directions pointed away from Jupiter along the local interplanetary magnetic field. The origin for the long-lived events appears to be inside the bow shock of the planet.

Received 8 February 1980; accepted 18 March 1980.

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Citation: Zwickl, R. D., S. M. Krimigis, T. P. Armstrong, and L. J. Lanzerotti (1980), Ions of Jovian Origin Observed by Voyageri and 2 in Interplanetary Space, Geophys. Res. Lett., 7(6), 453–456.

Copyright 1980 by the American Geophysical Union.