Context:
Aiming to understand magnetic reconnection process as a multi-hierarchy phenomenon, we have developed a multi-hierarchy simulation model which solves macroscopic and microscopic physics simultaneously and self-consistently. This multi-hierarchy model is based on the domain decomposition method. The simulation domain is divided into macro- and micro- hierarchies, which are calculated by different algorithms. The physics in the macro-hierarchy is solved by the MHD simulation algorithm and the dynamics in the micro-hierarchy is expressed by the PIC simulation algorithm. Between two hierarchies, an interface domain with a finite width is inserted for exchanging data. First, as examination, propagation of linear Alfven waves in the uniform magnetic field was simulated. It was confirmed that waves were smoothly propagated through the macro- and micro- hierarchies. Next, simulatoins of plasma flow injection were performed. Plasmas were injected from macro- to micro- hierarchies. In 2009, we have successfully demonstrated driven magnetic reconnection in the framework of the multi-hierarchy mode, in which plasmas come inward from macro- to micro- hierarchies and drive magnetic reconnection in the micro-hierarchy. Comparing this result with that of a pure PIC simulation, we confirm that magnetic reconnection found in the multi-hierarchy simulation represents a true physical phenomenon.