Kiel 2004 – wissenschaftliches Programm
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EP: Extraterrestrische Physik
EP 9: Poster-2
EP 9.6: Poster
Dienstag, 9. März 2004, 17:45–19:30, Foyer
Plasma Composition of the Jovian Magnetosphere — •Aikaterini Radioti1, Norbert Krupp1, Joachim Woch1, Andreas Lagg1 und Karl-Heinz Glassmeier2 — 1Max-Planck-Institut fuer Aeronomie, Max-Planck Str.2, 37191 Katlenburg-Lindau — 2TU Braunschweig, Institut fuer Geophysik, Mendelssohn str.3, 38106, Braunschweig
Galileo, as the first orbiting spacecraft around Jupiter, provides the opportunity to study globally the plasma composition of the Jovian magnetosphere. This enables to derive the relative importance of the various sources and sinks of plasma and disentangle different acceleration processes. Analyzing the data coming from the Energetic Particles Detector onboard Galileo, we present relative ion abundance ratio maps of S/O, S/He, O/He and H/He at various energy/nuc. A comparison of the abundance ratios coming from Galileo and previous flyby missions is presented.In average the S/O abundance ratio is distributed equally throughout the magnetosphere decreasing slightly with radial distance, which is in accordance with the iogenic origin of these ions.A pronounced energy dependence found for He points to a strikingly different acceleration process. Strong temporal and local timevariations are observed and possible interpretations are addressed.