Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsm41b..06w&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SM41B-06
Physics
2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
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.
Hu Yan
Richardson John D.
Wang Chenjie
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