Dusty Plasma Magnetosheath Characteristics And Nonlinear Tear Film Instability Numerical Simulation

Dust grains exist in the nature universally, including the experiment equipments. During the past several years, more and more attention was paid to the study of the dust, especially the dust plasmas. Nonlinear tearing mode instability is simple in space physics, and it is basic to research space physics.My paper includes two parts:In the first part, using 2_D model of MHD equation to caculate the tearing mode instability, and the result is: at the center of the current region, the velocity is faster than around out of the region, because at there the magnetic field is weak. As time goes by, tearing mode is to be stability. If the disturb becomes stronger, the reconnection will be easy to happen and the magnetic island will be wider.And the second part, using the fluid model and under the action of electrostatic, gravitational force and Lorentz force, the dust grains make a helical movement. The more charge number the dust grain carries the more obvious the magnetic field effects on it. The electron and ion density distribution and the electrostatic potential change a little in an oblique magnetic field. The magnitude of magnetic field in the z direction is the main reason for the fluctuating of the dust density distribution. The stronger the magnetic field in the z direction is, the more obvious the wave of the dust density distribution is.