Motion of magnetic flux tube produced by reconnection in Earth''''s magnetotail
地球磁尾中重联产生的磁流通管的运动

This paper has studied the motion of a thin magnetic flux tube through a two-dimensional stationary medium that is in equilibrium by an MHD theory. The flux tube is represented as a one-dimensional filament. Some properties of time development of the filament can be obtained from the numerical simulation. The magnetic field line in the filament created by reconnection is more dipolar than the surrounding magnetic field line, and the motion of the filament displays a strong earthward flow. The results show that the propagation of MHD waves such as an Alfven wave and a slow shock from the equatorial plane of magnetosphere to the Earth ionosphere, then partial reflection from the ionosphere. The motion toward the equator of the ionospheric end of the filament is delayed relative to the motion toward Earth in the equatorial plane. Though the plasma pressure in the filament initially is lower than its neighbors, its plasma pressure rose to values comparable to, or sometimes greater than, its neighbors once it started moving earthward fast enough.