MHD simulation study of the interplanetary shocks under different conditions

Details MHD simulation study of the interplanetary shocks under different conditions MHD simulation study of the interplanetary shocks under different conditions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31b1529a&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM31B-1529

Physics

[2139] Interplanetary Physics / Interplanetary Shocks, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions

Scientific paper

Simulation study of interplanetary shocks is important in order to describe dynamic process of their propagation and evolution during their passage through the Earth's magnetosphere as a whole in order to improve our observational knowledge of geospace. Our statistical analysis of a set of fast forward shocks shows that disturbance speed in the Earth's magnetosphere is higher than the original shock speed in the solar wind and differs according to the cone angle between the shock front normal in the solar wind and Sun-Earth line. Disturbance speed seems to be higher in all perpendicular cases than for oblique cases. For the purpose to describe this difference, GUMICS-4 global MHD simulation is used to calculate shock/disturbance propagation and evolution in different regions of the magnetosphere under different original conditions. Several methods are used to derive the propagation speeds and directions, such as Rankine-Hugoniot, velocity and magnetic coplanarity, and minimum variance analysis.

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