Energy Conversion in Magnetic Reconnection with Chaos Diffusion

Electromagnetic particle simulation is performed in order to investigate the behavior of collisionless driven reconnection in an open system. Ion frozen-in condition in the vicinity of magnetic neutral sheet is broken due to the growth of off-diagonal components of pressure tensor term. The relationship between the pressure tensor and the meandering motion in the ion dissipation region is clarified based on a simple model. The energy conversions to electron and ion energies occur actively in the vicinity of the reconnection region and in the downstream region, respectively. The field energy is converted to particle energy due to the reconnection process and the ratio of the ion thermal energy to the total energy in the outflow is good agreement with the observation by the Geotail satellite.