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Hybrid simulations with electron inertia, along with analytic scaling arguments, are presented which demonstrate that magnetic reconnection remains Alfvénic in a collisionless system even as the macroscopic scale length of the system becomes very large. This fast reconnection is facilitated by the whistler physics present near the x‐line. The reconnection rate is found to be a universal constant corresponding to an inflow velocity towards the x‐line of around 0.1 c A .
Shay et al. (Thu,) studied this question.