NSSC OpenIR  > 空间科学部
USING COORDINATED OBSERVATIONS IN POLARIZED WHITE LIGHT AND FARADAY ROTATION TO PROBE THE SPATIAL POSITION AND MAGNETIC FIELD OF AN INTERPLANETARY SHEATH
Xiong, Ming1,2; Davies, Jackie A.; Feng, Xueshang1; Owens, Mathew J.3; Harrison, Richard A.; Davis, Chris J.3; Liu, Ying D.1; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationASTROPHYSICAL JOURNAL
2013-11-01
Volume777Issue:1Pages:32
ISSN0004-642X
Language英语
KeywordMethods: Numerical Shock Waves Solar-terrestrial Relations Solar Wind Sun: Coronal Mass Ejections (Cmes) Sun: Heliosphere
AbstractCoronal mass ejections (CMEs) can be continuously tracked through a large portion of the inner heliosphere by direct imaging in visible and radio wavebands. White light (WL) signatures of solar wind transients, such as CMEs, result from Thomson scattering of sunlight by free electrons and therefore depend on both viewing geometry and electron density. The Faraday rotation (FR) of radio waves from extragalactic pulsars and quasars, which arises due to the presence of such solar wind features, depends on the line-of-sight magnetic field component B∥ and the electron density. To understand coordinated WL and FR observations of CMEs, we perform forward magnetohydrodynamic modeling of an Earth-directed shock and synthesize the signatures that would be remotely sensed at a number of widely distributed vantage points in the inner heliosphere. Removal of the background solar wind contribution reveals the shock-associated enhancements in WL and FR. While the efficiency of Thomson scattering depends on scattering angle, WL radiance I decreases with heliocentric distance r roughly according to the expression I∝r −3. The sheath region downstream of the Earth-directed shock is well viewed from the L4 and L5 Lagrangian points, demonstrating the benefits of these points in terms of space weather forecasting. The spatial position of the main scattering site rsheath and the mass of plasma at that position Msheath can be inferred from the polarization of the shock-associated enhancement in WL radiance. From the FR measurements, the local B∥sheath at rsheath can then be estimated. Simultaneous observations in polarized WL and FR can not only be used to detect CMEs, but also to diagnose their plasma and magnetic field properties.; Coronal mass ejections (CMEs) can be continuously tracked through a large portion of the inner heliosphere by direct imaging in visible and radio wavebands. White light (WL) signatures of solar wind transients, such as CMEs, result from Thomson scattering of sunlight by free electrons and therefore depend on both viewing geometry and electron density. The Faraday rotation (FR) of radio waves from extragalactic pulsars and quasars, which arises due to the presence of such solar wind features, depends on the line-of-sight magnetic field component B-parallel to and the electron density. To understand coordinated WL and FR observations of CMEs, we perform forward magnetohydrodynamic modeling of an Earth-directed shock and synthesize the signatures that would be remotely sensed at a number of widely distributed vantage points in the inner heliosphere. Removal of the background solar wind contribution reveals the shock-associated enhancements in WL and FR. While the efficiency of Thomson scattering depends on scattering angle, WL radiance I decreases with heliocentric distance r roughly according to the expression I alpha r(-3). The sheath region downstream of the Earth-directed shock is well viewed from the L4 and L5 Lagrangian points, demonstrating the benefits of these points in terms of space weather forecasting. The spatial position of the main scattering site r(sheath) and the mass of plasma at that position M-sheath can be inferred from the polarization of the shock-associated enhancement in WL radiance. From the FR measurements, the local B-parallel to sheath at r(sheath) can then be estimated. Simultaneous observations in polarized WL and FR can not only be used to detect CMEs, but also to diagnose their plasma and magnetic field properties.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1495
Collection空间科学部
Corresponding Author北京8701信箱
Affiliation1.Chinese Acad Sci, Ctr Space Sci & Appl Res, State Key Lab Space Weather, Beijing, Peoples R China
2.Beijing Aerosp Control Ctr, Sci & Technol Aerosp Flight Dynam Lab, Beijing, Peoples R China
3.Univ Reading, Reading, Berks, England
Recommended Citation
GB/T 7714
Xiong, Ming,Davies, Jackie A.,Feng, Xueshang,et al. USING COORDINATED OBSERVATIONS IN POLARIZED WHITE LIGHT AND FARADAY ROTATION TO PROBE THE SPATIAL POSITION AND MAGNETIC FIELD OF AN INTERPLANETARY SHEATH[J]. ASTROPHYSICAL JOURNAL,2013,777(1):32.
APA Xiong, Ming.,Davies, Jackie A..,Feng, Xueshang.,Owens, Mathew J..,Harrison, Richard A..,...&北京8701信箱.(2013).USING COORDINATED OBSERVATIONS IN POLARIZED WHITE LIGHT AND FARADAY ROTATION TO PROBE THE SPATIAL POSITION AND MAGNETIC FIELD OF AN INTERPLANETARY SHEATH.ASTROPHYSICAL JOURNAL,777(1),32.
MLA Xiong, Ming,et al."USING COORDINATED OBSERVATIONS IN POLARIZED WHITE LIGHT AND FARADAY ROTATION TO PROBE THE SPATIAL POSITION AND MAGNETIC FIELD OF AN INTERPLANETARY SHEATH".ASTROPHYSICAL JOURNAL 777.1(2013):32.
Files in This Item: Download All
File Name/Size DocType Version Access License
2013777132.pdf(3856KB)期刊论文出版稿开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Xiong, Ming]'s Articles
[Davies, Jackie A.]'s Articles
[Feng, Xueshang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Xiong, Ming]'s Articles
[Davies, Jackie A.]'s Articles
[Feng, Xueshang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Xiong, Ming]'s Articles
[Davies, Jackie A.]'s Articles
[Feng, Xueshang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: 2013777132.pdf
Format: Adobe PDF
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.