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EP: Fachverband Extraterrestrische Physik

EP 10: Poster

EP 10.14: Poster

Mittwoch, 28. März 2007, 18:00–20:00, H46

Magnetic cloud charge states and elemental composition determined from ACE/SWICS — •Roland Rodde¹, Robert F. Wimmer-Schweingruber¹, Lars Berger¹, Muharrem Köten¹, and Thomas H. Zurbuchen² — ¹Institut für Experimentelle und Angewandte Physik, University of Kiel, D-24098 Kiel, Germany — ²University of Michigan, Atmospheric, Oceanic and Space Sciences, 2455 Hayward St., Ann Arbor, MI 48109, USA

Magnetic clouds as a subgroup of ICMEs (Interplanetary Coronal Mass Ejections) show smooth rotation of their magnetic field vector. Fitting the magnetic field data allows us to determine the position of a spacecraft inside the magnetic cloud at a specific time.

A wide variety of compositional anomalies have been reported for magnetic clouds, e. g. enhanced helium/proton ratio or enhanced iron abundances. Another common feature are enhanced chargestates for oxygen and iron.

We analyse the spatial variation of compositional anomalies inside magnetic clouds using data from the Solar Wind Ion Composition Spectrometer (SWICS) and the magnetometer onboard the Advanced Composition Explorer (ACE).