Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh12b..07r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH12B-07
Physics
2104 Cosmic Rays, 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions
Scientific paper
Measurements from Voyager spacecraft at distant heliosphere show that cosmic rays are still modulated near the termination shock and even in the heliosheath. The September 2005 solar event propagated to the outer heliosphere, resulting in a very noticeable global merged interaction region (GMIR) at both Voyager 2 (still in the solar wind slightly insider the termination shock) and Voyager 1 (in the heliosheath). Decreases of galactic cosmic ray fluxes were observed in correlation with the GMIR. After the passage of GMIR, galactic cosmic ray fluxes have been recovering towards the solar minimum level, but cosmic ray flux at Voyager 2 is changing at a faster rate than at Voyager 1. The cosmic ray decreases in 2006 are definitely produced by the GMIR, but the cause of different rates of cosmic ray recovery after the GMIR is less certain. We use stochastic simulation of cosmic ray transport to investigate how the particle drift pattern and the GMIR, as a propagating diffusion barrier, can affect cosmic ray modulation in outer heliosphere. In this paper, we present calculation results of cosmic ray flux and its radial gradients when a GMIR passes the spacecraft near the termination shock or in the heliosheath. The results will be compared with observations to find out major causes of modulation under the current conditions in the outer heliosphere. We will also demonstrate how sensitive the cosmic ray modulation level and their recovery at the Voyager locations depend on the properties of GMIR in the heliosheath.
Rassoul Hamid K.
Richardson John D.
Zhang Minghui
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