Berlin 2005 – wissenschaftliches Programm

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EP: Extraterrestrische Physik

EP 8: Cassini bei Saturn

EP 8.3: Vortrag

Montag, 7. März 2005, 11:15–11:30, TU BH349

Investigation of CDA-Mass spectra of Jovian dust stream particles — •Frank Postberg — Max-Planck-Institut für Kernphysik, Heidelberg

During the Cassini Jupiter flyby in late 2000 the Cosmic Dust Analyser (CDA) was able to record more then 400 mass spectra of Jupiter dust stream particles. Due to the small size ( 10 nm) and high velocity (>200km/s) of those particles it is quite a complex task to extract chemical information from the data. Until now it even was uncertain whether the mass spectra could give hints to the chemical composition of the particles at all. The possibility could not be ruled out that the spectra only show ions of the detector target of the CDA and its contamination. To solve this problem comprehensive statistical analysis of the datasets and comparison with results of the dust accelerator facility at the MPI-K Heidelberg are in progress. For the first time this study also allows to evaluate correlations with mass spectra of Saturn stream particles which the Cassini spacecraft encounters since February this year. First results hint that some of the elements seen in the mass spectra do show ions of the dust particles. If so, this work might be helpful to get a better understanding of the origins of the Jovian dust stream particles.