EFFECTS OF THE INTENSITY OF MAGNETIC FIELD ON THE STEADY CORONAL STRUCTURE

Based on the 2-D MHD model and time relaxation method, using the pro- jective characteristic boundary conditions on the inner and outer boundaries, the effects of the magnetic field intensity on the steady coronal structures are investigated. The simulation results show that with the increasing dipolar magnetic field, the constraint of the magnetic field on the solar wind is strengthened, the degree of opening of the close magnetic field in the lower latitude decreases, the velocity difference between the higher latitude and the lower latitude increases, taking maximum near the point where Alfvenic mach number is 1, and the velocity transition region is steepened. On the other hand, with the increasing heliospheric distance, the velocity transition region is also steepened. The result can be used to qualitatively explain the Ulysses observations in the region far from the sun.