Overview of Run A1. (a) Time history of the reconnection electric field ﹩{E}_{y}﹩ (blue line), ﹩{\boldsymbol{J}}\cdot {\boldsymbol{E}}﹩ (purple line), and the ion temperature ﹩{T}_{i}﹩ (red line). The initial ion temperature ﹩{T}_{i}=0.4167{m}_{i}{V}_{A}^{2}﹩ is presented by the black dotted line. Three key time points are indicated by black dashed lines: the reconnection onset (﹩t=84{{\rm{\Omega }}}_{i}^{-1}﹩), the end of the electron-only stage (﹩t=95{{\rm{\Omega }}}_{i}^{-1}﹩), and the peak of the reconnection electric field (﹩t=126{{\rm{\Omega }}}_{i}^{-1}﹩). (b)–(d) The out-of-plane current density J_y at the three key time points.