Determining the magnetic field orientation of coronal mass ejections from Faraday rotation
文献类型：期刊论文
| 作者 | Liu, Y; Manchester, WB; Kasper, JC; Richardson, JD; Belcher, JW |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2007 |
| 卷号 | 665期号:2页码:1439-1447 |
| 关键词 | magnetic fields sun : coronal mass ejections (CMEs) |
| ISSN号 | 0004-637X |
| 通讯作者 | Liu, Y (reprint author), MIT, Kavli Inst Astrophys & space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA. |
| 英文摘要 | We describe a method with which to measure the magnetic field orientation of coronal mass ejections (CMEs) using Faraday rotation (FR). Two basic FR profiles, Gaussian-shaped with a single polarity or N-shaped with polarity reversals, are produced by a radio source occulted by a moving flux rope, depending on its orientation. These curves are consistent with Helios observations, providing evidence for the flux rope geometry of CMEs. Many background radio sources can map CMEs in FR onto the sky. We demonstrate with a simple flux rope that the magnetic field orientation and helicity of the flux rope can be determined 2-3 days before it reaches the Earth, which is of crucial importance for space weather forecasting. An FR calculation based on global magnetohydrodynamic (MHD) simulations of CMEs in a background heliosphere shows that FR mapping can also resolve a CME geometry that curves back to the Sun. We discuss implementation of the method using data from the Mileura Widefield Array (MWA). |
| 收录类别 | SCI |
| 语种 | 英语 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/5171]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Liu, Y,Manchester, WB,Kasper, JC,et al. Determining the magnetic field orientation of coronal mass ejections from Faraday rotation[J]. ASTROPHYSICAL JOURNAL,2007,665(2):1439-1447. |
| APA | Liu, Y,Manchester, WB,Kasper, JC,Richardson, JD,&Belcher, JW.(2007).Determining the magnetic field orientation of coronal mass ejections from Faraday rotation.ASTROPHYSICAL JOURNAL,665(2),1439-1447. |
| MLA | Liu, Y,et al."Determining the magnetic field orientation of coronal mass ejections from Faraday rotation".ASTROPHYSICAL JOURNAL 665.2(2007):1439-1447. |
入库方式： OAI收割
来源：国家空间科学中心
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