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arXiv 1202.0629astro-ph.SR
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2010年8月1日CME-CME相互作用事件期间日冕物质抛射的运动学特征

Characteristics of kinematics of a coronal mass ejection during the 2010 August 1 CME-CME interaction event

Manuela Temmer, Bojan Vrsnak, Tanja Rollett, Bianca Bein, Curt A. de Koning, Ying Liu, Eckhard Bosman, Jackie A. Davies, Christian Möstl, Tomislav Zic, Astrid M… 展开作者

Manuela Temmer, Bojan Vrsnak, Tanja Rollett, Bianca Bein, Curt A. de Koning, Ying Liu, Eckhard Bosman, Jackie A. Davies, Christian Möstl, Tomislav Zic, Astrid M. Veronig, Volker Bothmer, Richard Harrison, Nariaki Nitta, Mario Bisi, Olga Flor, Jonathan Eastwood, Dusan Odstrcil, Robert Forsyth

摘要:

利用STEREO/SECCHI COR和HI数据研究了2010年8月1日事件期间两次连续的日冕物质抛射(CME)的相互作用。我们获得的运动方向CME通过应用几个独立的重建方法,并发现CME头在类似的方向。这提供了证据表明,在HI 1视场中可以观察到的两个CME之间发生了完全的相互作用。通过结合1天文单位的CME的远程观测和现场测量,导出了从太阳到地球的更快CME的完全反投影运动学。速度较快的日冕物质抛射(日冕物质抛射2; ~1200 km/s)的速度分布图显示,在到达速度较慢的前一日冕物质抛射(日冕物质抛射1; ~700 km/s)的距离范围内,速度会大幅减速。通过应用基于拖动的模型,我们能够再现CME 2的运动学轮廓,这表明CME 1代表CME 2的磁流体动力学障碍,并且在相互作用之后,合并的实体在安静的太阳风条件下典型的速度和密度的环境流中作为单个结构传播。观测事实表明,磁力可能有助于增强CME 2的减速。我们推测,当CME 2弯曲和压缩CME 1的磁场线时,磁张力和压力的增加会增加阻力的效率。

英文摘要:

We study the interaction of two successive coronal mass ejections (CMEs) during the 2010 August 1 events using STEREO/SECCHI COR and HI data. We obtain the direction of motion for both CMEs by applying several independent reconstruction methods and find that the CMEs head in similar directions. This provides evidence that a full interaction takes place between the two CMEs that can be observed in the HI1 field-of-view. The full de-projected kinematics of the faster CME from Sun to Earth is derived by combining remote observations with in situ measurements of the CME at 1 AU. The speed profile of the faster CME (CME2; ~1200 km/s) shows a strong deceleration over the distance range at which it reaches the slower, preceding CME (CME1; ~700 km/s). By applying a drag-based model we are able to reproduce the kinematical profile of CME2 suggesting that CME1 represents a magnetohydrodynamic obstacle for CME2 and that, after the interaction, the merged entity propagates as a single structure in an ambient flow of speed and density typical for quiet solar wind conditions. Observational facts show that magnetic forces may contribute to the enhanced deceleration of CME2. We speculate that the increase in magnetic tension and pressure, when CME2 bends and compresses the magnetic field lines of CME1, increases the efficiency of drag.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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