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EP: Extraterrestrische Physik
EP 11: Heliosph
äre: Voyager im Heliosheath
EP 11.4: Fachvortrag
Mittwoch, 15. März 2006, 12:30–12:45, B
Solar Activity Cylce in the Heliosheath — •KLaus Scherer1 and Stefan Ferreira2 — 1Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Physics, North-West University, 2520 Potchefstroom, South Africa
In recent years, a lot of effort was put in the modeling of the heliospheric structures in the Outer Heliosphere and their effects on cosmic ray transport. The interest has risen as Voyager 1 recently passed the solar wind termination shock. The latest development of dynamic heliospheric models showed that the variation in solar wind speed and number density due to the solar activity cycle caused density and pressure waves which moving downward into the tail direction. Because the solar wind speed during a solar activity cycle remains fairly constant in the ecliptic, this features are developing 35∘ above the ecliptic in upwind direction, but influence the plasma flow in the ecliptic tail direction. The time and latitudinal dependence of these features will be presented and discussed. Particularly, the compression ratio and injection rate at the termination shock, which are important parameters for the acceleration of anomalous cosmic rays, will be study, as well the polarity changes of the magnetic field in the heliosheath.