Abstract
Three-dimensional asymmetric magnetic reconnection (AMR) driven by ultraintense femtosecond (fs) lasers is investigated by relativistic particle-in-cell (PIC) simulation. The reconnection rate is found to be only one-third of that in the previous symmetric reconnection PIC simulations. Similar to the case of dayside reconnection at geomagnetopause, magnetic X- and velocity stagnation points are not colocated, with the X-point at the lower field side and the stagnation point at the higher field side. Moreover, the moving direction of the X-point as reconnection evolving with the laser irradiation is determined by δBH/δBL, and the moving of stagnation point is dominated by neHBL/neLBH, where δB and ne are the magnetic field disturbance and the electron density with the subscripts “H” for the higher field side and “L” for the lower field side, respectively. Then, the hosing instability triggered by AMR and the merging of two parallel currents resulting in the tilt of the electron beam generated by the weak laser are also investigated.
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