Freiburg 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
EP: Fachverband Extraterrestrische Physik
EP 4: The Sun and Heliosphere - Poster Session
EP 4.10: Poster
Montag, 3. März 2008, 17:30–19:00, Vorraum KGI-Aula
Compositional variations in magnetic clouds with ACE/SWICS — •Roland Rodde1, Lars Berger1, Muharrem Köten1, Thomas Zurbuchen2, and Robert F. Wimmer-Schweingruber1 — 1Institut fur 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 (MCs) are a subgroup of Interplanetary Coronal Mass Ejections (ICMEs) showing a smooth rotation in their magnetic field vector and often enhanced magnetic field s trength. From ICME studies a wide variety of compositional anomalies compared to normal solar wind is known (Richardson and Cane 2004). Enhanced iron charge states, enhanced O7/O 6 ratios, and enhanced helium to proton ratios are common examples. From fitting the magnetic field inside a MC the trajectory of a spacecraft through the flux-rope MC can be reconstructed, allowing us to obtain spatially resolved compositional d ata. The considered MCs were observed from 2001 to 2007 using the magnetometer and the SWICS (Solar Wind Ion Composition Spectrometer) instrument onboard ACE (Advanced Compositio n Explorer). A total number of approx. 50 MCs were investigated, most of them were taken from the WIND list which ends in early 2006. We have completed the survey up to mid 2007 and als o present the new MCs. The MCs were investigated for spatial heterogeneity with the aim to find trends for distinct compositional features.