9:45 AM - 10:00 AM
[PEM17-04] Formation Mechanism of Petschek-type Reconnection Region in Uniform Resistivity Plasma
Keywords:Magnetic reconnection, MHD, Solar flare
We conducted numerical experiment of magnetic reconnection in high Lundquist number (low resistivity) regime and discovered Petschek-type diffusion region appear in a time dependent manner even with uniform resistivity (Shibayama et al. 2015). Furthermore, we developed local model with plasmoid, which allows a formation of quasi-steady Petschek-type fast reconnection in uniform resistivity. In this model, asymmetry of diffusion region between plasmoids restrict the motion of X-point and flow stagnation point. As a result, diffusion region is localized nearby a plasmoid. Reconnection rate is determined by the Petschek-type diffusion region, not by the Sweet-Parker scaling. We can develop a new reconnection regime with Petschek-type model.