Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm41a1442s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM41A-1442
Other
7827 Kinetic And Mhd Theory, 7833 Mathematical And Numerical Techniques (0500, 3200), 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
Although many kinds of simulation models have been developed to understand the complex plasma systems, the physical process and the spatial-temporal scales must be restricted by the fundamental assumption of each model. However, the interaction across multiple scales may play a crucial role in some plasma phenomena. Magnetic reconnection process is the typical example, where the kinetic process in the micro- scale instability may interact with the large scale magnetohydrodynamics (MHD). We have developed the new simulation model, in which the interaction between the macroscopic and microscopic processes is able to be taken into account self-consistently, by directly interlocking the MHD simulation and the particle-in-cell (PIC) simulation models. The MHD-PIC interlocked model is first applied to the study of the auroral arc formation process, in which both the Alfven wave resonance instability and the electron acceleration in the double layer structure formed by the ion-acoustic instability are calculated simultaneously. It is our great challenge to establish the interlocked simulation frame-work which is applicable in many fields. Here, we will present another example of the MHD-PIC interlocked model for the magnetic reconnection process. Since the kinetics in the magnetic diffusion region is so important as to determine the reconnection rate and the trigger activity of reconnection, therefore, the PIC simulation must be used in this region. On the other hand, the large-scale configuration of the anti-parallel magnetic field and the plasma conditions surrounding the diffusion region are crucial for the creation of the diffusion region as well as for the subsequent the reconnection dynamics. The dynamics in the global-scale are well modeled by the MHD simulation. These well characterized points in both MHD and PIC models are efficiently utilized by being simultaneously calculated. Our simulation model can well interlock the micro kinetics of PIC and the macro conditions of MHD. In this presentation, we will explain the algorithm of the new model how we interlock the MHD and PIC models in the simulation, and show the results of that, which has been calculated in the Earth Simulator.
Kusano Kanya
Sugiyama Takanori
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