The Diffusion Region of Asymmetric Magnetic Reconnection

Computer Science – Learning

Scientific paper

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2723 Magnetic Reconnection (7526, 7835), 2724 Magnetopause And Boundary Layers, 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

The reconnection on the dayside magnetopause can have very disparate inflow plasma conditions on either side of the x-line, with high density/low magnetic field on the magnetosheath side and low density/high magnetic field on the magnetospheric side. Learning the properties of this asymmetric reconnection will greatly improve our understanding of the dayside magnetosphere as well as help the implementation of the Magnetospheric Multiscale Mission (MMS). Although a simulation analysis of diffusion region structures has been performed for resistive MHD simulations (Cassak and Shay, 2007), our understanding in the collisionless case is much less complete. We perform Hall MHD and kinetic PIC simulations of asymmetric reconnection, and present the resultant diffusion region structures. It is found that, in accordance with basic scaling theory, the stagnation point and x-line are not co-located. Most interesting (Cassak and Shay, 2007), however, is that the electron and ion stagnation points are also not co-located due to their disparate masses. The Hall MHD and PIC simulations are compared to shed light on the underlying physics responsible for the diffusion region structures. The simulations are also compared with the symmetric case to determine if the non-steady character of reconnection has any dependence on asymmetries. P. A. Cassak and M. A. Shay, Physics of Plasmas, 14, 102114, 2007.

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