【摘要】 对于不同磁场强度冕旒位形中，热驱动日冕瞬变的数值模拟表明，β（＝2μ0P／B2）值的大小对瞬变的形态有重要的控制作用，只有β较小（如太阳表面赤道处β0等于0．25）时才可重现典型环状CMEs观测形态：足部出现在开场与闭场的交界面上，在纬向基本不动；CMEs顶部物质变化在传播过程中沿电流片两侧移动，使顶部物质密度变化比两侧小．更多还原

【Abstract】 The simulation of corona response caused by the pressure disturbance shows that the value of βP(=2μ0P/B2) Plays an important role in controlling the structure of the transient.Only in lower β situation (For example: the value of β at the equator of the sun’s surface is 0.25 or less), can we reappear the typical shape of looplike CMEs: the legs of the looplike CMEs at the surface appear between the open and closed magnetic field,show little movement in the latitudinal direction; the initial change of the top material appears on both sides of the current sheet during its outward propagation, the relative variation of density at the top becomes less than both sides.更多还原