Time: 2010-05-29 10:00:00
Speaker: Zhichen Feng, Chenglong Zhang [IFTS]
Place: Rm. 413, Bld. 11#, Yuquan Campus
Abstract: Topic1: a genuine particle simulation without any statistical assumptions
Speaker: Zhichen Feng
Abstract: The PIC simulation is a kind of mean field simulation without the effects of discrete particles, i.e. the collisions, and different particles in PIC simulation can even at a same point, so the PIC simulation is not a genuine particle simulation. I would like to introduce and discuss with you a method approach to simulate plasma ab initio, a genuine particle simulation without any statistical assumptions, though it is far from validity for real systems.
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Topic2: Explosive magnetic reconnection phase in Double Current Sheet Systems
Speaker: Chenglong Zhang
Abstract: Explosive magnetic reconnection phase in Double Current Sheet systems is investigated using Hall magnetohydrodynamics simulations. In the Hall dominant regime, the magnetic field configuration in the reconnection region evolves from Y-type to X-type geometry, which leads to fast reconnection in the nonlinear growth phase. The maximum reconnection rate in the explosive growth phase is found to have a scaling and the maximum total kinetic energy scales as . In the regime with weak Hall effect, it is found that the elongated thin current sheet formed in the early phase is broken into two X-points, forming a magnetic island in the late stage, instead of shrinking to an X-type geometry.
