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We use the MHD with embedded particle-in-cell model (MHD-EPIC) to study theGeospace Environment Modeling (GEM) dayside kinetic processes challenge eventat 01:50-03:00 UT on 2015-11-18, when the magnetosphere was driven by a steadysouthward IMF. In the MHD-EPIC simulation, the dayside magnetopause is coveredby a PIC code so that the dayside reconnection is properly handled. We comparethe magnetic fields and the plasma profiles of the magnetopause crossing withthe MMS3 spacecraft observations. Most variables match the observations well inthe magnetosphere, in the magnetosheath, and also during the current sheetcrossing. The MHD-EPIC simulation produces flux ropes, and we demonstrate thatsome magnetic field and plasma features observed by the MMS3 spacecraft can bereproduced by a flux rope crossing event. We use an algorithm to automaticallyidentify the reconnection sites from the simulation results. It turns out thatthere are usually multiple X-lines at the magnetopause. By tracing thelocations of the X-lines, we find the typical moving speed of the X-lineendpoints is about 70~km/s, which is higher than but still comparable with theground-based observations.

Magnetohydrodynamic with embedded particle-in-cell simulation of the Geospace Environment Modeling dayside kinetic processes challenge event