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In this paper, by performing a two-dimensional particle-in-cell simulation,we investigate magnetic reconnection in the downstream of a quasi-perpendicularshock. The shock is nonstationary, and experiences a cyclic reformation. At thebeginning of reformation process, the shock front is relatively flat, and partof upstream ions are reflected by the shock front. The reflected ions moveupward in the action of Lorentz force, which leads to the upward bending ofmagnetic field lines at the foot of the shock front, and then a current sheetis formed due to the squeezing of the bending magnetic field lines. The formedcurrent sheet is brought toward the shock front by the solar wind, and theshock front becomes irregular after interacting with the current sheet. Boththe current sheet brought by the solar wind and the current sheet associatedwith the shock front are then fragmented into many small filamentary currentsheets. Electron-scale magnetic reconnection may occur in several of thesefilamentary current sheets when they are convected into the downstream, andmagnetic islands are generated. A strong reconnection electric field and energydissipation are also generated around the X line, and high-speed electronoutflow is also formed.

Two-dimensional particle-in-cell simulation of magnetic reconnection in the downstream of a quasi-perpendicular shock