Stuttgart 2012 – scientific programme
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EP: Fachverband Extraterrestrische Physik
EP 14: Poster Sonne und Heliosphäre
EP 14.3: Poster
Wednesday, March 14, 2012, 16:30–19:00, Poster.V
On Cosmic Ray Modulation in the Heliosheath and beyond the Heliopause — •Klaus Scherer1, Horst Fichtner1, DuToit Strauss2, Stefan Ferreira2, MArius Potgieter2, and Hans-Jörg Fahr3 — 1Institut für Theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Centre for Space Research, North-West University, 2520 Potchefstroom,South Africa — 3Argelander Institute, Universität of Bonn, D-53121 Bonn, Germany
Two of the paradigms in modeling the transport of galactic cosmic rays are that the modulation boundary is the heliopause and that the local interstellar spectra are identical to the galactic cosmic ray spectra. Here we demonstrate, that the proton spectrum is already modulated, due to an altered interstellar diffusion in the outer heliosheath as a consequence of the heliospheric "obstacle" in the interstellar flow. The main modulation effect however is adiabatic energy losses during a "confinement time" of cosmic rays inside the heliosphere. Additionally, we show that the anomlaous cosmic rays diffuse beyond the heliopause and contribute to the galactic cosmic ray spectrum in the lower energy range.