HR: 09:16h
AN: SM41B-06    [Abstracts]
TI: 3D Global Simulation of the Interaction of Interplanetary Shocks with the Magnetosphere
AU: * Wang, C
EM: cw@space.mit.edu
AF: Center for Space Science and Applied Research, Chinese Academy of Sciences, China, P.O.Box 8701, Beijing, 100080 China
AU: * Wang, C
EM: cw@space.mit.edu
AF: MIT Center for Space Research, 77. Mass. Ave., Cambridge, MA 02139 United States
AU: Hu, Y
EM: yqhu@ustc.edu.cn
AF: University of Science and Technology of China, China, School of Earth and Space Science University of Science and Technology of China, Hefei, 230026 China
AU: Richardson, J D
EM: jdr@space.mit.edu
AF: MIT Center for Space Research, 77. Mass. Ave., Cambridge, MA 02139 United States
AB: It is well known that the sudden commencement of geomagnetic storms may be caused by the global compression of the magnetosphere as a result of interplanetary disturbances such as shocks, dynamic pressure pulses etc. Before interplanetary shocks reach the magnetopause, they interact with the bow shock and traverse the magnetosheath. Understanding the interaction of interplanetary shocks with the magnetosphere is crucial to space weather studies. In this paper, the collision of interplanetary shocks with the bow shock and magnetopause and their propagation towards the magetotail are investigated using the Piecewise Parabolic Method (PPM) MHD code in 3D. The PPM algorithm is a high-order extension of the Godunov scheme accurate to third-order in smooth regions of flow), which can capture shocks and discontinuities within 1-2 grid points with negligible numerical dissipation. The arrival of an interplanetary shock wave causes the abrupt displacement of the whole bow shock-magnetopause system toward Earth, and the moving shock remains nearly planar (the shape of the undisturbed shock) as it passes through the magnetosheath. The results are mostly consistent with the gas dynamic work of Stahara and Spreiter.
DE: 2753 Numerical modeling
DE: 2784 Solar wind/magnetosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting