Modulation Near the Termination Shock: Stochastic Particle Studies using an MHD Heliosphere

Details Modulation Near the Termination Shock: Stochastic Particle Studies using an MHD Heliosphere Modulation Near the Termination Shock: Stochastic Particle Studies using an MHD Heliosphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh11c1109b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH11C-1109

Physics

2104 Cosmic Rays, 2124 Heliopause And Solar Wind Termination, 7843 Numerical Simulation Studies, 7859 Transport Processes

Scientific paper

Voyager observations near the termination shock have shown strong modulation of cosmic ray flux. In a recent study using stochastic particle simulations we showed that particles may cross the shock multiple times, and as a result we can obtain modulation even in regions where there is no divergence in the velocity field. Here we apply this idea to an MHD model of the heliosphere, which includes a non spherical termination shock boundary and a heliosheath region where the velocity field divergence is not identically zero. We will show the relative contributions to modulation from several regions, including the pre-shock solar wind, the shock itself, and the heliosheath. Comparisons will also be made with Voyager data.

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