| Determining the magnetic field orientation of coronal mass ejections from Faraday rotation | |
| Liu, Y; Manchester, WB; Kasper, JC; Richardson, JD; Belcher, JW; Liu, Y (reprint author), MIT, Kavli Inst Astrophys & space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA. | |
| Department | 空间科学部 |
| Source Publication | ASTROPHYSICAL JOURNAL
 |
| 2007 | |
| Volume | 665Issue:2Pages:1439-1447 |
| ISSN | 0004-637X |
| Language | 英语 |
| Keyword | Magnetic Fields Sun : Coronal Mass Ejections (Cmes) |
| Abstract | 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). |
| Indexed By | SCI |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/5171 |
| Collection | 空间科学部 |
| Corresponding Author | Liu, Y (reprint author), MIT, Kavli Inst Astrophys & space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA. |
| Recommended Citation 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,&Liu, Y .(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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| 20086651439.pdf（1236KB） | 开放获取 | CC BY-NC-SA | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment