The plasma heating mechanism during magnetic reconnection in the presence of guide magnetic field is investigated by means of particle simulations and test particle simulations. Particle simulations demonstrate that ring-like structures of ion velocity distributions are formed in the downstream, where a large percentage of ions are effectively heated. Furthermore, a single ion motion is focused upon by using test particle simulations. The ion moves in the downstream direction owing to the E × B drift while in gyromotion. Finally, it is reported that the profile of the ion temperature obtained by the particle simulation fits well with the profile observed in the TS-3 experiment.
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