Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62a05w&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SH62A-05
Physics
2139 Interplanetary Shocks, 2152 Pickup Ions
Scientific paper
The Bastille Day (July 14) 2000 CME is a fast, halo coronal mass ejection event headed earthward. The ejecta reached Earth on July 15, 2000 and produced a very significant magnetic storm and aurora. At 1 AU the Wind spacecraft recorded a strong forward shock with a speed jump from ~ 600 to over 1100 km~s-1. About 6 months later, this CME-driven shock arrived at Voyager 2 ( ~ 63 AU) on January 12, 2001 with a speed jump of about 60 km~s-1. This provides a good opportunity to study shock propagation in the outer heliosphere. In this study, we employ a 2.5-D MHD numerical model, which includes mutual influences of solar wind protons and interstellar neutrals, to investigate the shock propagation in detail. Our numerical result shows that this shock undergoes a dramatic change in character while propagating through the outer heliosphere. Its strength and propagation speed decay significantly with distance. The model result at the location of Voyager 2 is in good agreement with in situ observations.
Richardson John D.
Wang Chenjie
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