Field-aligned plasma flow in MHD simulations of magnetotail reconnection and the formation of boundary layers

Physics

Scientific paper

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Field Aligned Currents, Geomagnetic Tail, Magnetic Field Reconnection, Magnetohydrodynamic Flow, Space Plasmas, Boundary Layer Plasmas, Compressible Flow, Flow Velocity, Parallel Flow

Scientific paper

The outflow from a reconnection region in a realistic magnetotail geometry is studied using a two-dimensional time-dependent, compressible, resistive MHD code. Two cases are emphasized: (1) the evolution of near-earth reconnection, which grows in the form of an internal unstable mode after gradual externally forced changes have initiated an anomalous dissipation process, and (2) the evolution of more distant reconnection under influence of a nonuniform inflow that forces reconnection to occur at a given location in the distant tail. In both cases, it is demonstrated that plasma flow is primarily parallel to the magnetic field in regions away from the localized area of reconnection and outside a narrow central layer.

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