Propagation of the Bastille Day 2000 CME Shock in the Outer Heliosphere |
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Authors: | Wang Chi Richardson John D Burlaga Len |
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Institution: | (1) Center for Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, U.S.A;(2) Laboratory for Space Weather, Chinese Academy of Sciences, Beijing, China;(3) Goddard Space Flight Center, Greenbelt, MD, 20771, U.S.A |
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Abstract: | The Bastille Day (14 July) 2000 CME is a fast, halo coronal mass ejection event headed earthward. The ejection reached Earth
on 15 July 2000 and produced a very significant magnetic storm and widespread aurora. At 1 AU the Wind spacecraft recorded a strong forward shock with a speed jump from ∼ 600 to over 1000 km s−1. About 6 months later, this CME-driven shock arrived at Voyager 2 (∼ 63 AU) on 12 January 2001 with a speed jump of ∼ 60 km s−1. This provides a good opportunity to study the shock propagation in the outer heliosphere. In this study, we employ a 2.5-D
MHD numerical model, which takes the interaction of solar wind protons and interstellar neutrals into account, to investigate
the shock propagation in detail and compare the model predictions with the Voyager 2 observations. The Bastille Day CME shock undergoes a dramatic change in character from the inner to outer heliosphere. Its
strength and propagation speed decay significantly with distance. The model results at the location of Voyager 2 are in good agreement with in-situ observations.
Supplementary material to this paper is available in electronic form at http://dx.doi.org/10.1023/A:1014293527951 |
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