Greifswald 2009 – wissenschaftliches Programm
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SYPA: Energetic Particle Acceleration in Space and Laboratory
SYPA 1: Particle Acceleration
SYPA 1.5: Vortrag
Mittwoch, 1. April 2009, 18:45–19:00, Zahnklinik
The acceleration of the Anomalous component of Cosmic Rays revisited — •Reinald Kallenbach1,2, Martin Hilchenbach1, and Karin Bamert2 — 1Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str.2,37191,Katlenburg-Lindau,Germany — 2Physikalisches Institut, University of Bern, CH-3012 Bern, Switzerland
In the years 2004 and 2007, the instruments onboard the Voyager 1&2 spacecraft delivered unprecedented data on the solar wind plasma flow near its termination shock. This shock has been assumed to be responsible for the acceleration of the Anomalous component of Cosmic Rays from a pick-up ion seed population derived from the interstellar neutral gas penetrating the heliosphere. In expectation of the Voyager observations, detailed models have been developed on the acceleration mechanisms for the Anomalous Cosmic Rays. We summarize the different theoretical approaches on injection mechanisms into first-order Fermi acceleration, on stochastic acceleration in the supersonic and subsonic solar wind, and on the mediation and reformation of the termination shock. Comparing the results of these models to the Voyager observations, but also to energetic neutral atom data of SOHO/CELIAS/HSTOF, we try to compose an updated picture of the heliosheath plasma flow and of the structure of the solar wind termination shock.