Heidelberg 2006 – wissenschaftliches Programm
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EP: Extraterrestrische Physik
EP 11: Heliosph
äre: Voyager im Heliosheath
EP 11.3: Fachvortrag
Mittwoch, 15. März 2006, 12:15–12:30, B
Modulation in a Three-Dimensional Heliosheath — •Horst Fichtner1, Langner Ulrich2, Potgieter Marius3, and Borrmann Thorsten1 — 1Ruhr-Universität Bochum, Institut für Theoretische Physik — 2University of California, Riverside, USA — 3Northwest University, Potchefstroom, South Africa
A three-dimensional model of the heliosphere is used to study the effects of the heliosheath on the modulation of cosmic ray protons. Using a sophisticated modulation model, the spectra of galactic and anomalous protons are computed for heliocentric distances ranging from 1 AU to 180 AU, i.e. well into the heliosheath. We discuss the effect of the large-scale structure of the heliosphere on these spectra and relate the findings to the measurements of the Voyager 1 spacecraft that has recently crossed the solar wind termination shock and is now performing in-situ measurements in the heliosheath.