Greifswald 2009 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 14: Planets and Small Bodies III
EP 14.8: Vortrag
Donnerstag, 2. April 2009, 17:45–18:00, HS-Ost Pharmazie
stream particles observation during the Cassini-Huygens flyby of Jupiter — •hsiang-wen hsu1,2, sascha kempf1,3, caitriona jackman4, ralf srama1,5, georg moragas-klostermeyer1, stefan helfert1, and eberhard gruen1,6 — 1MPI für Kernphysik, Heidelberg, Germany — 2Mineralogisches Institute, Ruprecht-Karls Universität, Heidelberg, Germany — 3Institut für Geophysik und extraterrestrische Physik, Universität Braunschweig, Braunschweig, Germany — 4Imperial College London, London, United Kingdom — 5Institut für Raumfahrtsysteme, Universität Stuttgart, Stuttgart, Germany — 6LASP, University of Colorado, USA
On December 30, 2000, the Cassini-Huygens spacecraft flew by at Jupiter at a distance of 137 RJ (Jupiter radius, 71 400 km). Six months before the closest approach, when the spacecraft was about 1 AU (astronomical unit) away from Jupiter, the Cassini dust detector started to register impacts of fast (∼ 200 km/s) and tiny (∼ 10 nm) grains, so-called stream particles. In contrast to the dust detection of the Galileo and Ulysses spacecrafts, the Cassini instrument observed a contiuous flux of stream particles coming from the Cassini-Jupiter line-of-sight. Based on the CDA data and structure of the interplanetary field, we provide quantitative constrains on the physical properties of Jovian stream particles and explain the differences between the stream particle observations by the Ulysses, Galileo, and Cassini instruments.