单流体二维太阳风结构的磁流体力学模拟

在添加动量项的条件下，对单流体二维磁流体力学方程组进行模拟，得到了子午面上的太阳风结构，结果表明，添加动量项的形式及其被加入的位置对远区太阳风速度和质子密度有重要的影响。本文在适当的区域加入合适的动量项得出了远区太阳风速和质子密度与Ulysses观测基本符合的结果。文中给出了较合适的动量添加区域为3.5-10Rs(Rs为太阳半径）。

SINGLE FLUID 2D MAGNETOHYDRODYNAMIC SIMULATION OF SOLAR WIND STRUCTURE

In this paper, single fluid 2D MagnetoHydroDynamic (MHD) equations with a momentum addition is used to simulate the solar wind structure on the meridian plane. With the comparison between the simulation results and observations by Ulysses, it is found that the form and deposited location of the momentum addition have great effect on solar wind velocity and density far away from the Sun. An appropriate momentum addition is adopted to calculate the solar wind velocity and density and obtained similar results with the Ulysses observations. It is found that the acceleration process simulated near the Sun agrees well with the data observed. The momentum addition should be deposited on 3.5-10 solar radii as a conclusion of the paper, and the result provides some clues for the problem of the solar wind acceleration mechanism.