2-D MHD and Hall-MHD local simulations of the Kelvin-Helmholtz Instability at the Ionopause of Mars

Details 2-D MHD and Hall-MHD local simulations of the Kelvin-Helmholtz Instability at the Ionopause of Mars 2-D MHD and Hall-MHD local simulations of the Kelvin-Helmholtz Instability at the Ionopause of Mars

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm23a1684b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM23A-1684

Physics

6225 Mars, 7835 Magnetic Reconnection (2723, 7526), 7836 Mhd Waves And Instabilities (2149, 2752, 6050), 7859 Transport Processes, 7863 Turbulence (4490)

Scientific paper

Our previous simulation results and comparison with Cluster spacecraft data have shown that reconnection can be generated in thin current layers produced by the Kelvin-Helmholtz Instability (KHI) at the Earth's magnetosphere. Our simulation studies of the KHI for the Earth's magnetospheric parameters have shown that reconnection due to KHI can facilitate efficient plasma transport from the solar wind to the magnetosphere during northward IMF conditions producing diffusion coefficients of the order 109 m2/s. When the magnetic fields are initially parallel and the asymmetry is small across the initial shear flow layer the reconnection inside KH vortices occurs always first at the high-density spine of the vortex -leading to plasma transport from high-density magnetosheath to low density magnetosphere. We expect that in Mars and Venus this process may be reversed because the plasma inside the ionopause is more dense that in the solar wind. Although, Mars and Venus are un-magnetized the IMF will have a strong impact on the evolution of the KHI. We will present a systematic parameter study of the Kelvin-Helmholtz instability at the ionopause of Mars using 2-D local MHD and Hall-MHD approximations. The efficiency and direction of the plasma transport will be investigated for the typical plasma and magnetic field profiles observed in the vicinity of the Martian ionopause.

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