Quantitative Calculation of the Velocity Field of the Loop Prominence System of 1984 February 18

The falling motin of the matter within the loop system is studied in this paper under the joint action of the solar gravity, the gradient of the magnetic pressure of the dipole and the gradient force of the gas pressure and the two-dimensional sight-line velocity field of the loop system is calculated by use of the numerical method on the assumption that one has an isothermic and quasi-closed loop system. The relative physical parameters within the system and their distribution are derived from the fitting of the theoretically calculated results of the velocity field with the observed results. The calculated results indicate that the density and the intensity of the magnetic field within the loop system have an obvious influence on the falling motion of matter, but the influence of the temperature on the falling motion is relatively small.