日冕波和日冕结构的相互作用

Interactions of a Solar Coronal Wave with Solar Coronal Structures

日冕波自从被发现以来,关于它是不是真正的波一直是太阳物理学界的热门话题,直到现在还没有一致的结论。2011年8月4日,太阳动力学天文台(Solar Dynamics Observatory,SDO)利用19.3 nm波段观测到一个日冕波,通过对这个日冕波的研究,发现日冕波在传播过程中和一些日冕结构发生了相互作用,当日冕波遇到暗条通道时,一部分日冕波发生了反射,另一部分日冕波继续沿着原来的方向传播,当日冕波遇到活动区时,日冕波以非常快的速度穿过活动区并且形成一个新的半弧型的亮波前,通过分析认为这可能是日冕波在遇到该活动区时发生了折射,折射波穿过活动区后形成了这个新的半弧型的亮波前。而当日冕波和两个日冕亮结构相互作用时,发现日冕波连续发生了二次反射。从观测到的日冕波在遇到暗条通道和日冕亮结构发生了反射,在遇到活动区时发生了折射等现象可以推断出这里观测到的日冕波可能是真正的波动现象。

Since solar coronal waves were discovered, whether these waves are true waves has been an actively studied subject which is still inconclusive. On August 4, 2011, the Solar Dynamics Observatory （SDO） observed a coronal wave in the 19.3nm channel. We have found from the SDO data that the coronal wave interacted with several coronal structures. When the coronal wave encountered a filament channel, the coronal wave was split into a reflection component and a transmission component with the latter propagating along the original direction of the wave. When the coronal wave passed through an active region with a high speed a new bright semi-arc wave front was formed. Based on our analysis, we think the semi-arc wave front may belong to a refraction component of the coronal wave due to certain interaction with the active region. After the refraction component passed through the active region, its wave front appeared in the semi-arc shape. The coronal wave was also reflected when it interacted with two bright structures in the corona. All the reflections/refraction as found imply that this coronal wave is a true wave.