Regensburg 2007 – wissenschaftliches Programm
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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).