Magnetic Reconnection Driven By Boundary Perturbations

Magnetic reconnection is a significant research hotspot in the plasma physics of the solar system, and is the regular and fundamental physical phenomenon in the space plasma and experimental plasma processes. The theory about magnetic reconnection is adopted usually to resolve and explain various explosive processes observed in the plasma of the solar system;the results and observations in the recent time demonstrate that the reconnection always happens in the magnetospheric plasma, solar atmosphere, and cometic magnetosphere as well as fusion equipments. Nevertheless, owing to the complexity of the problem, the real physical process of magnetic reconnection should to be researched further, and the inner relations between the reconnection and various phenomena in solar plasma have not been known clearly, these above are all the focuses among the solar physicists and space physicists recently, especially driven magnetic reconnection is regarded as the main kind to gain more attention for its plentiful complexity.Considering the above significant values for research, firstly the fundamental theories about the space physics will be introduced in this thesis, and the classical models and the physical processes about the reconnection are presented particularly in this segment, subsequently some calculational methods used here are expatiated necessarily, finally, comparing with tearing instability in plasma, driven (or forced) reconnection by boundary perturbations will discussed and computed by the MagnetoHydroDynamics (MHD) simulation. Reconnection rate is the main focus in this work, and its scale and trend could be the demonstrations for the reconnection degree, thus the rules and relations between the rates with the perturbations are to be summarized in the last segment. As to concrete treating method, the thesis adds the components in third dimension to the original 2D MHD code, and inward flows are embedded along the side of the current sheet, through changes of certain flow's scale, its distance to the current sheet, the viscosity coefficient and the resistivity in the plasma, the magnetic field figure, the velocity vector figure and the density distribution figure with different situations would be showed and observed, the reconnection growth rate figure is to be presented also, and the physical explanation involved will be made consequently. Owing to some enhanced modifications beyond the basic model and physical phenomena found in the figures, the research and results in this thesis are actually valuable and worthy for the development of the geospace physics about magnetic reconnection to a certain extent.