Title:  Combined energetic particle measurements onboard Galileo and Cassini in the vicinity of Jupiter during the period between October 2000 and March 2000
Author(s):  N. Krupp(1) Main Session Speaker, A. Lagg(1), J. Woch(1), S. Livi(2), S.M. Krimigis(2), D.J. Williams(2)
(1)   Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany (krupp@linmpi.mpg.de)
(2) The Johns Hopkins University Applied Physics Laboratory, Laurel, MD 20723-6099, USA (tom.krimigis@jhuapl.edu)

ABSTRACT
The rendezvous of the Galileo and Cassini spacecraft in December 2000 in the vicinity of Jupiter offers the opportunity to combine measurements inside and outside the Jovian magnetosphere. We present energetic particle measurements from instruments on both spacecraft (Energetic Particles Detector EPD on Galileo and the Low Energy Magnetospheric Measurement System LEMMS on Cassini). Both instruments operate in the energy range from a few tens of keV to a few MeV and are able to measure angular distributions of electrons and ions separately. During the inbound pass of Cassini, Galileo is first outside the Jovian magnetosphere moving inward through the dusk magnetosphere towards the planet (October –December 2000). During Cassini’s outbound pass (December 2000- March 2001) Galileo is deep in the inner magnetosphere and moves outwards. This configuration offers a chance to study energetic particle distributions in interplanetary space, including Jovian upstream events, as well as distributions in the Jovian magnetosheath, and inside the Jovian magnetosphere to find out if and how processes in the solar wind influence the magnetospheric configuration.