Leakage of energetic particles from Jupiter's dusk magnetosphere: Dual spacecraft observations

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Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF, file size: 783914 bytes) GEOPHYSICAL RESEARCH LETTERS, VOL. 29, NO. 15, 1736, doi:10.1029/2001GL014290, 2002 Leakage of energetic particles from Jupiter's dusk magnetosphere: Dual spacecraft observations N. Krupp Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany J. Woch Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany A. Lagg Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany S. A. Espinosa Max-Planck-Institut für Aeronomie, Katlenburg-Lindau, Germany S. Livi The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA S. M. Krimigis The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA D. G. Mitchell The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA D. J. Williams The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA A. F. Cheng The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA B. H. Mauk The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA R. W. McEntire The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA T. P. Armstrong Fundamental Technology, Lawrence, Kansas USA D. C. Hamilton University of Maryland, College Park, Maryland, USA G. Gloeckler University of Maryland, College Park, Maryland, USA J. Dandouras Centre d'Etude Spatiale des Rayonnement, CNRS/Université Paul Sabatier, Toulouse, France L. J. Lanzerotti Bell Laboratories, Lucent Technology, Murray Hill, New Jersey, USA Abstract For the first time, two spacecraft, Galileo and Cassini, observed Jupiter's magnetosphere simultaneously for nearly half a year between October 2000 and March 2001. This provided an unprecedented opportunity to disentangle spatial and temporal aspects of the dynamics of the Jovian magnetosphere. In this paper we report new results on the source of the leakage of energetic particles (electrons with energy 15 keV to several MeV and ions with energy > 30 keV) from the dusk side of the magnetosphere. The dual spacecraft measurements show clearly that magnetospheric particles leak directly into the interplanetary medium from the closed magnetosphere, and are the source for the “upstream” particle events [ Baker et al., 1996 ; Zwickl et al., 1981 ; Krimigis, 1992 ; Haggerty and Armstrong, 1999 ; Anagnostopoulos et al., 1998 ] that have been reported from instruments during prior single spacecraft encounters with the planet. These events, consisting of high-energy particles of Jovian origin, have been observed throughout the heliosphere [ Baker and Van Allen, 1976 ] and their propagation has recently been modelled [ Fichtner et al., 2000 ; Ferreira et al., 2001 ]. Jupiter then is an important contributor to the interplanetary charged particle fluxes, especially within an astronomical unit of the planet. Published 13 August 2002. Index Terms: 2764 Magnetospheric Physics: Plasma sheet; 2708 Magnetospheric Physics: Current systems (2409); 2788 Magnetospheric Physics: Storms and substorms; 2704 Magnetospheric Physics: Auroral phenomena (2407); 2744 Magnetospheric Physics: Magnetotail. Subscriber Access to Full Article (Nonsubscribers may purchase for $9.00, Includes print PDF, file size: 783914 bytes) Citation: Krupp, N., et al. (2002), Leakage of energetic particles from Jupiter's dusk magnetosphere: Dual spacecraft observations, Geophys. Res. Lett., 29(15), 1736, doi:10.1029/2001GL014290. Copyright 2002 by the American Geophysical Union.

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