The influence of out-of-plane shear flow on Hall magnetic reconnection and FTE generation

Based on the three-dimensional Hall magnetohydrodynamic (MHD) simulations and in situ measurements of THEMIS spacecraft, magnetic reconnection driven by an out-of-plane shear flow in the symmetric Harris current sheet, asymmetric case with a guide field, specially the parameters in one case based on a vivo flux transfer event (FTE) observed by THEMIS spacecraft, are all calculated. The simulation results show that during the Hall reconnection processes, the out-of-plane shear flow could make the initial single X-line bifurcated, and then a magnetic island (without guide field) or flux rope (with guide field) generated and grown up quickly. In $\sim$240 Alfven time (204 seconds) the flux rope could be reach to one Earth radius (Re), the typical scale of FTE observed in the dayside magnetopause. These results give some clues on the generation mechanism of FTE. References: Chen Y. G., Xiao C. J., Wang X. G., et al., J. Geophys. Res., doi:10.1029/2013ja50417, (2013)