MHD simulation for the interaction of an interplanetary shock with the Earth's magnetosphere

Details MHD simulation for the interaction of an interplanetary shock with the Earth's magnetosphere MHD simulation for the interaction of an interplanetary shock with the Earth's magnetosphere

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11212220s&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A12, CiteID A12220

Physics

21

Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Interplanetary Physics: Interplanetary Shocks, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Magnetic Storms And Substorms (7954)

Scientific paper

The global BATS-R-US MHD code is used to simulate the interaction of a moderately strong interplanetary shock with the Earth's magnetosphere. The model predicts the propagation of a transmitted fast shock through the magnetosheath and magnetosphere and the reflection of this shock from the inner numerical boundary. The reflected fast shock propagates sunward through the dayside magnetosphere and magnetosheath. The passage of the transmitted shock causes the bow shock and magnetopause to move inward, while the passage of the reflected fast shock causes these boundaries to move outward, consistent with previously reported in situ observations. A supplementary study employing a one-dimensional MHD model addresses the interaction of the forward fast shock with the plasmapause. This study demonstrates that most of the energy associated with the fast shock energy penetrates into the plasmasphere. Consequently, the transmitted fast wave must reach the ionosphere, produce the well known sudden impulse signatures, and then be reflected due to the shielding effects of ionospheric currents. The predictions of the numerical simulations are consistent with observations of the dayside geosynchronous magnetic field.

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