关于冲击波在环形磁场中的传播

本文求解了点源爆炸波在环形磁场中传播的非自型问题。以耀斑引起的击波传播为例讨论了解的应用。从中可以看到,磁场扰动呈U形,主要发生在0.5Re—1.0Re的击波区域;行星际磁场的存在使击波到达1AU的时间延长了几个小时;击波必须具有大于磁截止能量E_M=λ₁S2/4π J₀R时(符号意义见内容)才有可能传播到1AU以远的地方,日冕磁场结构对耀斑击波进入行星际空间的传播有重要作用。 

THE BLAST WAVE PROPAGATING IN A VARIABLE DENSITY MEDIUM WITH RING-MAGNETIC FIELD

The non-similar questions of the blast waves which propagate in a variable density medium with ring-magnetic field has been treated.On the basis of the analytical solution obtained by this paper the propagating of the solar flare-shock waves have been discussed.When the flare shock waves propagate into the interplanetary space,the configuration of magnetic field appears U-type,and mainly occurs in the part of the head of a shock wave (>0.5R).It has some similarity as the cosmic ray storms and the magnetic storms.Particularly noteworthy is the fact that the flare-shock waves must have higher energy than the magnetic cut-off energy E_m=(λ₁S₂/4π) j₀R_sh(λ₁,j₀ are the parameters relative to a shock wave respectively,8 is the constant proportional to the ring-magnetic field at the reference point).It is possible that the flare-shock waves propagate into the interplanetary space.The ring-closed region of the magnetic field has stronger constraint to the propagation of the shock wave.It can be qualitatively explained that after the occurrence of the solar flare-shock waves a number of geophysical disturbance phenomena are not always observable on the earth,which will be relative to the configurations of the magnetic field on the solar flare.