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arXiv 1301.2176astro-ph.SR
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冕洞对行星际日冕物质抛射观测结构的影响

Coronal Hole Influence on the Observed Structure of Interplanetary CMEs

P. Mäkelä, N. Gopalswamy, H. Xie, A. A. Mohamed, S. Akiyama, S. Yashiro

摘要:

我们报告了冕洞(CH)对54个磁云(MC)和非MC相关的日冕物质抛射(CME)的影响,这些磁云和非MC相关的CME被选为协调数据分析研讨会(CDAW)的研究对象,重点是如果所有的CME都是通量绳的问题。所有选定的日冕物质抛射都起源于15 E-15 W之间的源区。Xie,Gopalswamy和St,Cyr(2013,Solar Phys.,doi:10.1007/s11207-012-0209-0)发现这些MC和非MC相关的CME平均分别朝向和远离日地线偏转。我们使用了CH影响参数(CHIP),取决于CH面积,平均磁场强度,和距离CME源区来描述的影响,所有盘上的CH上爆发的CME。我们发现,对于CHIP值大于2.6 G的MC和非MC事件分为两个不同的组,其中MC(非MC)偏转朝向(远离)磁盘中心。当到最近的CH的距离小于3.2x10^5 km时,也观察到两组。当CHIP值小于2.6 G或最近CH的距离大于3.2x10^5 km时,MC和非MC的偏转分布开始重叠,表明CH的影响逐渐减小。这些结果支持了所有的日冕物质抛射都是磁绳的观点,但在1天文单位处观测到的非日冕物质抛射可能会被附近的日冕物质抛射偏离日地线,使得它们的磁绳结构在1天文单位处无法观测到。

英文摘要:

We report on the coronal hole (CH) influence on the 54 magnetic cloud (MC) and non-MC associated coronal mass ejections (CMEs) selected for studies during the Coordinated Data Analysis Workshops (CDAWs) focusing on the question if all CMEs are flux ropes. All selected CMEs originated from source regions located between longitudes 15E-15W. Xie, Gopalswamy, and St, Cyr (2013, Solar Phys., doi:10.1007/s11207-012-0209-0) found that these MC and non-MC associated CMEs are on average deflected towards and away from the Sun-Earth line respectively. We used a CH influence parameter (CHIP) that depends on the CH area, average magnetic field strength, and distance from the CME source region to describe the influence of all on-disk CHs on the erupting CME. We found that for CHIP values larger than 2.6 G the MC and non-MC events separate into two distinct groups where MCs (non-MCs) are deflected towards (away) from the disk center. Division into two groups was also observed when the distance to the nearest CH was less than 3.2x10^5 km. At CHIP values less than 2.6 G or at distances of the nearest CH larger than 3.2x10^5 km the deflection distributions of the MC and non-MCs started to overlap, indicating diminishing CH influence. These results give support to the idea that all CMEs are flux ropes, but those observed to be non-MCs at 1 AU could be deflected away from the Sun-Earth line by nearby CHs, making their flux rope structure unobservable at 1 AU.

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