Bremen 2000 – scientific programme

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EP: Extraterrestrische Physik

EP 9: Sonne und Heliosph
äre III

EP 9.7: Talk

Wednesday, March 22, 2000, 17:30–17:45, H1

Modulation of Anomalous Cosmic Rays beyond the heliospheric shock — •H. Fichtner¹ and A. Czechowski² — ¹Ruhr-Universität Bochum, Germany — ²Space Research Centre, Polish Academy of Sciences, Warsaw, Poland

As the Voyager spacecraft are expected to encounter the heliospheric termination shock within the next decade, it is timely to extend the study of the transport of energetic particles to the region beyond, i.e. to the heliosheath. The anticipated in-situ observations in this subsonic solar wind regime will supplement our knowledge not only about various energetic particle populations like galactic as well as anomalous cosmic rays (GCRs,ACRs), pick-up ions (PUIs) and energetic neutral atoms (ENAs), but also about the global structure of the heliosphere. In order to facilitate interpretation of forthcoming data, we have developed a model for the modulation of ACRs in the heliosheath that is based on the cosmic ray transport equation and employing a realistic solar wind background flow computed with a self-consistent large-scale model of the heliosphere. The results, i.e. the spatial distribution as well as the spectra of ACRs in the boundary region of the heliosphere will be presented.