Solar wind plasma entry observed by cluster in the high-latitude magnetospheric lobes
Solar wind plasma entry observed by cluster in the high-latitude magnetospheric lobes
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高纬度磁层波瓣中星团观测到的太阳风等离子体进入
DOI：
10.1002/2015ja021578
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发表时间：
2016
影响因子：
2.8
通讯作者：
Shen X. C.
中科院分区：
文献类型：
--
作者：
Gou X. C.;Shi Q. Q.;Tian A. M.;Sun W. J.;Dunlop M. W.;Fu S. Y.;Zong Q. G.;Facsko G.;Nowada M.;Pu Z. Y.;Mailyan B.;Xiao T.;Shen X. C.
利用2001-2006年1-4月期间的星系团观测资料，我们发现在向北的行星际磁场(IMF)作用下，地球高纬度磁层叶的尾部发生了磁重联导致的太阳风进入。本研究中太阳风进入事件的发生率与Shih等人所报道的2002年至2004年8月至10月的星团轨道间隔的发生率相同。(2013年)。在本文中，我们根据我们的数据库和史等人的不同磁偶极子倾斜变化的研究，进一步研究了IMFBx和By分量在控制太阳风等离子体进入中的作用。(2013年)。研究表明，北半球和南半球太阳风进入事件的不对称分布可能是由磁偶极子倾角的变化引起的，而磁偶极子倾角的变化会影响高纬磁层顶上重联地点的位置。另一方面，IMFBx也会影响太阳风等离子体的入射率，这也与之前的结果一致。因此，我们得出结论，太阳风进入大叶的“南北不对称”可能是磁偶极子倾斜和IMFBx共同作用的结果。此外，IMFBy分量可以与IMFBx分量的变化一起影响进入事件，这与IMF的帕克螺旋线是一致的。
Using the Cluster data during the period from January to April between 2001 and 2006, we find an observation of solar wind entry due to magnetic reconnection occurred in the terrestrial high‐latitude magnetospheric lobes, tailward of the cusps under northward interplanetary magnetic field (IMF). Occurrence rate of solar wind entry events in this study is of the same order as that for the Cluster orbital interval from August to October between the years of 2002 and 2004 as reported by Shi et al. (2013). In this paper, we further study the role of the IMFBxandBycomponents in the control of solar wind plasma entry based on the investigations of different magnetic dipole tilt variations between our database and Shi et al. (2013). This study shows that the asymmetry distribution of solar wind entry events in the northern and southern lobes could be caused by the variation of magnetic dipole tilt, which could influence the locations of the reconnection site on the high‐latitude lobe magnetopause. On the other hand, IMFBxcan also affect the solar wind plasma entry rate, which is also consistent with previous results. Therefore, we conclude that the “north‐south asymmetry” of solar wind entry events in the lobes could be the combined result of magnetic dipole tilt and IMFBx. In addition, the IMFBycomponent can influence the entry events in conjunction with the variation of IMFBxcomponent, which is in line with the Parker Spiral of the IMF.