Observations of flux rope formation in the outer corona

被引:29
作者
Wang, Y. -M. [1 ]
Sheeley, N. R., Jr. [1 ]
机构
[1] USN, Res Lab, EO Hulburt Ctr Space Res, Washington, DC 20375 USA
关键词
Sun : corona; Sun : coronal mass ejections (CMEs); Sun : magnetic fields;
D O I
10.1086/506611
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In previous studies employing the Large Angle and Spectrometric Coronagraph (LASCO), we identified a class of white-light ejections that separate into incoming and outgoing components at distances of similar to 3-5 R(circle dot) from Sun center. These events, of which up to several per month are observed during high solar activity, are generally preceded by a gradual outward expansion of faint loops over a period of a day or more. The expansion terminates when the streamer material, in the form of an elongated stalk or a sheetlike structure, suddenly tears apart. The collapsing material is sometimes recognizable as a collection of loops, while the ejected component is usually poorly resolved. Here we describe a streamer detachment observed on 2005 December 11, in which the outgoing component can be clearly identified as a cylindrical flux rope with its ends anchored in the Sun. Based on simple three-dimensional white-light reconstructions, we conclude that in/out pairs in general represent the pinching off of streamer loop arcades to form flux ropes, as seen from different viewing angles.
引用
收藏
页码:1172 / 1183
页数:12
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