不稳定磁位形破裂引起的类波现象的数值实验
Numerical Experiments of Wave-Like Phenomena Caused by the Disruption of an Unstable Magnetic Configuration
摘要：
在色球层中观察到的莫尔顿波和在日冕中观察到的EIT波的起源在一段时间内仍然是一个活跃的研究课题。在这项工作中，我们调查数值的磁配置，包括一个载流磁通绳，这是用来模拟灯丝，在系统中的平衡发生在一个灾难性的方式失去后的演变特征。灾变后磁通绳的快速运动引起绳后的速度涡，也可能引起绳前的慢模和快模激波。在磁绳两侧的速度涡大致水平地传播远离产生它的区域，并且两个冲击都向磁绳的侧面扩展。快的一个可能最终到达底部边界，并产生两个回波返回到日冕，但慢的一个和涡完全衰减在较低的日冕中的某个地方之前到达底部边界。快激波与边界的相互作用导致的扰动解释了在Halalpha中观察到的Moreton波，而由慢激波和速度涡引起的日冕中的扰动应该解释了EIT波，其速度约为Moreton波的40%。本文还讨论了这些结果对观测到的II型射电爆发与快、慢模激波以及EIT波与日冕物质抛射和耀斑的相关性的意义。
英文摘要：
The origin of the Moreton wave observed in the chromosphere and the EIT wave observed in the corona during the eruption remains being an active research subject for a while. We investigate numerically in this work the evolutionary features of the magnetic configuration that includes a current-carrying flux rope, which is used to model the filament, after the loss of equilibrium in the system takes place in a catastrophic fashion. Rapid motions of the flux rope following the catastrophe invokes the velocity vortices behind the rope, and may invoke as well slow and fast mode shocks in front of the rope. The velocity vortices at each side of the flux rope propagate roughly horizontally away from the area where it is produced, and both shocks expand toward the flank of the flux rope. The fast one may eventually reach the bottom boundary and produces two echoes moving back into the corona, but the slow one and the vortices totally decay somewhere in the lower corona before arriving the bottom boundary. The interaction of the fast shock with the boundary leads to disturbance that accounts for the Moreton wave observed in Halpha, and the disturbance in the corona caused by the slow shock and the velocity vortices should account for the EIT wave whose speed is about 40% that of the Moreton wave. Implication of these results to the observed correlation of the type II radio burst to the fast and the slow mode shocks, and that of EIT waves to CMEs and flares have also been discussed.
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