2004年7月13日爆发事件中的吸收现象和可能的冲击波
Absorption Phenomena and a Probable Blast Wave in the 13 July 2004 Eruptive Event
摘要：
我们提出了一个案例研究的2004年7月13日的太阳活动，在其中所造成的扰动爆发的灯丝从一个活跃的区域拥抱了四分之一的可见太阳表面。值得注意的是在SOHO/EIT 304 A通道中观察到的吸收现象;它们在EIT 195 A通道，H-α线，甚至在总无线电通量记录中也可见。还观察到了日冕波和Moreton波。多光谱数据使人们得以重建这一事件的全貌。爆发性暗条爆发和相关的脉冲耀斑产生了CME和爆炸冲击波，两者都是独立减速和传播的。日冕波和莫尔顿波运动学上接近，都按照预期的运动的日冕爆炸冲击波减速。日冕物质抛射并不像经典的三分量结构，可能是因为部分抛射物质落回了太阳。不同观测的定量评估提供了对下落质量的接近估计，约为3 10^15 g，这接近于CME的估计质量。下落的物质导致了观测到的大尺度吸收现象，特别是在195 A处观测到的浅的广泛移动的暗化。相比之下，深准静态调暗观察到在这条带附近的爆发中心是由于等离子体密度下降的日冕结构。
英文摘要：
We present a case study of the 13 July 2004 solar event, in which disturbances caused by eruption of a filament from an active region embraced a quarter of the visible solar surface. Remarkable are absorption phenomena observed in the SOHO/EIT 304 A channel; they were also visible in the EIT 195 A channel, in the H-alpha line, and even in total radio flux records. Coronal and Moreton waves were also observed. Multi-spectral data allowed reconstructing an overall picture of the event. An explosive filament eruption and related impulsive flare produced a CME and blast shock, both of which decelerated and propagated independently. Coronal and Moreton waves were kinematically close and both decelerated in accordance with an expected motion of the coronal blast shock. The CME did not resemble a classical three-component structure, probably, because some part of the ejected mass fell back onto the Sun. Quantitative evaluations from different observations provide close estimates of the falling mass, ~3 10^15 g, which is close to the estimated mass of the CME. The falling material was responsible for the observed large-scale absorption phenomena, in particular, shallow widespread moving dimmings observed at 195 A. By contrast, deep quasi-stationary dimmings observed in this band near the eruption center were due to plasma density decrease in coronal structures.
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