Regensburg 2007 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 10: Poster
EP 10.15: Poster
Mittwoch, 28. März 2007, 18:00–20:00, H46
Suprathermal tails of solar wind ion velocity distribution functions from ACE/SWICS — •Lars Berger1, Muharrem Köten1, Jim Raines2, Robert F. Wimmer-Schweingruber1, 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
Solar wind ion velocity distributions (VDFs) are shaped by two processes in the inner heliosphere. Investigation of VDFs allows us to distinguish the relative importance of Coulomb-interaction which tends to drive the solar wind isothermal and wave-particle interactions which tend to heat the wind in a mass-proportional manner. We analyse data from the solar wind ion composition spectrometer (SWICS) on the Advanced Composition Explorer (ACE) using a maximum-likelihood analysis technique based on Poissonian statistics that is well adapted to the low fluxes of the suprathermal tails on the flanks of velocity distributions. We present results for different extended periods of constant solar wind speed, and compare them to previous studies.