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arXiv 1408.4604astro-ph.SRphysics.space-ph
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2011年2月13-15日三次相互作用的日冕物质抛射的形态学和运动学演化

Morphological and Kinematic Evolution of Three Interacting Coronal Mass Ejections of 2011 February 13-15

Wageesh Mishra, Nandita Srivastava

摘要:

2011年2月13日至15日,STEREO的日冕仪(COR)记录到了3次连续发射的CME。这些日冕物质抛射提供了一个机会,从多个有利位置研究其几何和运动学演变。在本文中,我们研究的差异,在几何演化的慢速和快速的日冕物质抛射在其传播过程中的日光层。我们还使用STEREO/SECCHI COR和日光层成像仪(HI)观测研究它们的相互作用和碰撞。我们已经发现了2月15日和14日CME之间的相互作用和碰撞的证据,分别在COR 2和HI 1 FOV,而2月14日的CME捕获2月13日的CME在HI 2 FOV。通过估算这些CME的真实质量,并利用它们碰撞前后的动力学,研究了碰撞阶段它们之间的动量和能量交换。我们将2月14日和15日观测到的CME之间的碰撞的性质归类为非弹性的,接近弹性制度。将成像观测结果与现场观测结果相结合,发现日冕物质抛射体在日球层碰撞后相互靠近,并被WIND探测器在L1处的现场观测结果识别为不同的结构。我们的研究结果突出了HI观测在研究CME-CME碰撞以改进空间天气预报方面的意义。

英文摘要:

During 2011 February 13 to 15, three Earth-directed CMEs launched in successively were recorded as limb CMEs by coronagraphs (COR) of STEREO. These CMEs provided an opportunity to study their geometrical and kinematic evolution from multiple vantage points. In this paper, we examine the differences in geometrical evolution of slow and fast speed CMEs during their propagation in the heliosphere. We also study their interaction and collision using STEREO/SECCHI COR and Heliospheric Imager (HI) observations. We have found evidence of interaction and collision between the CMEs of February 15 and 14 in COR2 and HI1 FOV, respectively, while the CME of February 14 caught the CME of February 13 in HI2 FOV. By estimating the true mass of these CMEs and using their pre and post-collision dynamics, the momentum and energy exchange between them during collision phase are studied. We classify the nature of observed collision between CME of February 14 and 15 as inelastic, reaching close to elastic regime. Relating imaging observations with the in situ measurements, we find that the CMEs move adjacent to each other after their collision in the heliosphere and are recognized as distinct structures in in situ observations by WIND spacecraft at L1. Our results highlight the significance of HI observations in studying CME-CME collision for the purpose of improved space weather forecasting.

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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