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ZHANG BEI-CHEN; WANG JING-FANG; XIONG DONG-HUI (Department of Space Physics, Wuhan University, Wuhan 430072, China)  
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.
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