Hall-MHD model of dipolarization fronts

Physics

Scientific paper

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[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2744] Magnetospheric Physics / Magnetotail, [2753] Magnetospheric Physics / Numerical Modeling

Scientific paper

Recent studies of transient reconnection show presence of dipolarization fronts which are characterized by a steep increase or jump in the z component of the earth’s tail magnetic field. This has been reported in satellite data as well as kinetic simulations. One possible interpretation of these jumps is the formation of shocks using the standard MHD Rankine-Hugoniot relations. Furthermore in the shock region, strong wave activity is observed. Using jump conditions obtained from MHD, an initial value code for the 1D Hall-MHD system of equations is then solved to investigate the role of Hall physics on these shocks. Because of the strong coupling between the z component and an out-of-plane y component of the magnetic field in Hall-MHD, a y component develops when the initial condition does not have a By component. The sharp shock discontinuity leads to the generation of whistler waves which does not require a linear instability mechanism. The electric fields generated by these waves are comparable to the measured fields.

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