The Dynamic Outer Heliosphere and Preliminary Analysis of GCR Trajectories

Details The Dynamic Outer Heliosphere and Preliminary Analysis of GCR Trajectories The Dynamic Outer Heliosphere and Preliminary Analysis of GCR Trajectories

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1302...31w&link_type=abstract

PICKUP IONS THROUGHOUT THE HELIOSPHERE AND BEYOND: Proceedings of the 9th Annual International Astrophysics Conference. AIP Con

Astronomy and Astrophysics

Astrophysics

7

Magnetohydrodynamics, Shock Wave Effects, Galactic Cosmic Rays, Magnetohydrodynamics And Plasmas, Heliopause And Solar Wind Termination, Cosmic Rays

Scientific paper

We show realistic and time-varying 3D MHD models of the outer heliosphere which satisfy both Voyager 1 (V1) and Voyager 2 (V2) observed crossing times of the termination shock (TS) simultaneously. The short-term variations found are a) the TS position increases whenever a solar-wind high-ram pressure pulse collides with the TS, b) a large amplitude magneto-sonic pulse is generated downstream of the TS when a solar-wind high ram pressure pulse collides with the TS, c) the generated pulse propagates outward in the heliosheath and is reflected at the plasma sheet, and d) when the reflected pulse collides with the TS, the TS position decreases. We also present preliminary results of galactic cosmic rays (GCRs) trajectories as they respond to three-dimensional global electric and magnetic fields in the outer heliosphere. This allows us to investigate (1) how GCRs cross the heliosphere and enter the inner heliosphere, and (2) their long-term variation. Preliminary GCR distributions in the outer heliosphere are shown. GCR diffusion due to magnetic-field fluctuations is not taken into account in this analysis.

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