Determining the location of termination shock using signature of Galactic cosmic ray modulation by global merged interaction region in the heliosheath

Details Determining the location of termination shock using signature of Galactic cosmic ray modulation by global merged interaction region in the heliosheath Determining the location of termination shock using signature of Galactic cosmic ray modulation by global merged interaction region in the heliosheath

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh21b1819l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH21B-1819

Physics

Plasma Physics

[2104] Interplanetary Physics / Cosmic Rays, [2124] Interplanetary Physics / Heliopause And Solar Wind Termination, [7859] Space Plasma Physics / Transport Processes

Scientific paper

Global Merged Interaction Region (GMIR) is a shell-like solar wind structure with enhanced magnetic field and solar wind speed. Acting as a propagating diffusion barrier, it is known that GMIR affects the cosmic ray transport inside the termination shock. In order to investigate the GMIR effect in the heliosheath region, we incorporate a GMIR model into our cosmic ray modulation code, which uses stochastic integration method to solve the Parker transport equation. Our simulations show that GMIR still affects cosmic ray modulation inside the heliosheath. But details of modulation profile are different from the supersonic solar wind region: cosmic ray intensity inside heliosheath experiences two transient decreases, one corresponding to GMIR arrival at the termination shock, the other occurring at GMIR arrival locally. Measurements of >70Mev cosmic rays by Voyager 1 in 2006 shows similar two-step decrease caused by the GMIR initiated at the sun in September 2005 CME events. Based on this feature, we estimate that the termination shock should locate at radial distance ~91AU along the Voyager 1 direction in March 2006, indicating that the termination shock has moved in ~3 AU since the first crossing by Voyager 1 in December 2004 at ~94 AU.

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