Abstract
Collisionless magnetic reconnection in a Harris current sheet with different initial thicknesses is investigated using a 212-D Darwin particle-in-cell simulation with the magnetosonic open boundary condition. It is found that the thicknesses of the ion dissipation region and the reconnection current sheet, when the reconnection rate Er reaches its first peak, are independent of the initial thickness of the current sheet; while the peak reconnection rate depends on it. The peak reconnection rate increases with decrease of the current sheet thickness as Er∼a−1/2, where a is the initial current sheet half-thickness.
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