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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 PublicationASTROPHYSICAL JOURNAL
2007
Volume665Issue:2Pages:1439-1447
ISSN0004-637X
Language英语
KeywordMagnetic Fields Sun : Coronal Mass Ejections (Cmes)
AbstractWe 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 BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5171
Collection空间科学部
Corresponding AuthorLiu, 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.
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