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arXiv 1709.10263physics.space-ph
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与复型II射电爆发相关的连续日冕物质抛射的传播和相互作用特性

Propagation and Interaction Properties of Successive Coronal Mass Ejections in Relation to a Complex Type II Radio Burst

Ying D. Liu, Xiaowei Zhao, Bei Zhu

摘要:

我们研究了2001年11月21日至22日连续三次日冕物质抛射(CME)的传播和相互作用特性,重点是它们与相关的长持续时间复杂的II型射电爆发的行为。结合日冕物质抛射和多点原位观测,长持续时间的II型爆发为解决三个CME的传播和相互作用的复杂性提供了关键特征。11月22日的两个CME首先相互作用,然后在距离太阳约0.85 AU的地方超过11月21日的CME。最初由最后一次CME驱动的激波传播通过前两次CME的时间尺度估计分别为14和6小时。我们提出了一个简单的分析模型,没有任何自由参数来描述整个太阳到地球的冲击波传播,这表明了显着的一致性与所有可用的数据和MHD模拟,甚至到距离的100万(2.34 AU)。在地球和赤道上的现场测量的协调,这是分开的约$71.4^{\circ}$纬度,提供了重要的线索,为了解冲击结构和现场签名的解释。这些结果还指出了利用多个日冕物质抛射增加地球有效性的方法,这可以被认为是[liu14a]提出的“完美风暴”情景的另一种表现,尽管目前的情况与2012年7月23日事件的意义不同。

英文摘要:

We examine the propagation and interaction properties of three successive coronal mass ejections (CMEs) from 2001 November 21-22, with a focus on their connection with the behaviors of the associated long-duration complex type II radio burst. In combination with coronagraph and multi-point in situ observations, the long-duration type II burst provides key features for resolving the propagation and interaction complexities of the three CMEs. The two CMEs from November 22 interacted first and then overtook the November 21 CME at a distance of about 0.85 AU from the Sun. The time scale for the shock originally driven by the last CME to propagate through the preceding two CMEs is estimated to be about 14 and 6 hr, respectively. We present a simple analytical model without any free parameters to characterize the whole Sun-to-Earth propagation of the shock, which shows a remarkable consistency with all the available data and MHD simulations even out to the distance of Ulysses (2.34 AU). The coordination of in situ measurements at the Earth and Ulysses, which were separated by about $71.4^{\circ}$ in latitude, gives important clues for the understanding of shock structure and the interpretation of in situ signatures. The results also indicate means to increase geo-effectiveness with multiple CMEs, which can be considered as another manifestation of the "perfect storm" scenario proposed by [liu14a] although the current case is not "super" in the same sense as the 2012 July 23 event.

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