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Improvement to the global distribution of coronal plasma and magnetic field on the source surface using expansion factor f(s) and angular distance theta(b)
Shen, Fang; Feng, Xueshang; Xiang, Changqing; Shen, F (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
2012
Volume77Pages:125-131
ISSN1364-6826
Language英语
KeywordGlobal Coronal Plasma And Field Distribution Expansion Factor f(s) Angular Distance Theta(b)
AbstractIn this paper, we have developed an improved model to build a self-consistent global structure on the source surface of 2.5 Rs covering four different phases of solar activity. This model involves the topological effect of the magnetic field expansion factor f(s) and the minimum angular distance theta(b) (at the photosphere) between an open field foot point and its nearest coronal hole boundary. The purpose of this effect is to separate the open field area and the close field area more effectively. The model uses as input for 136 Carrington Rotations (CRs) covering four different phases of solar activity: (1) an empirical model of the magnetic field topology on the source surface using Line-of-sight (los) photospheric field (B-los) measurements by Wilcox Solar Observatory (WSO): and (2) an empirically derived global coronal density distribution using K coronal polarized brightness (pB) by MKIII in High Altitude Observator (HAO). The solar wind speed on the source surface is specified by the function of both f(s) and theta(b), which are obtained by the magnetic field data. Then the coronal mass outputs are analyzed and the self-consistent global distribution on the source surface is numerically studied for the four different phases. Finally, the model estimates the solar wind speed at 1 AU as a simple function of the speed on the source surface. Our numerical results indicate reasonable semi-quantitative agreement with observations at different phases of solar activity. (C) 2011 Elsevier Ltd. All rights reserved.; In this paper, we have developed an improved model to build a self-consistent global structure on the source surface of 2.5 Rs covering four different phases of solar activity. This model involves the topological effect of the magnetic field expansion factor f(s) and the minimum angular distance theta(b) (at the photosphere) between an open field foot point and its nearest coronal hole boundary. The purpose of this effect is to separate the open field area and the close field area more effectively. The model uses as input for 136 Carrington Rotations (CRs) covering four different phases of solar activity: (1) an empirical model of the magnetic field topology on the source surface using Line-of-sight (los) photospheric field (B-los) measurements by Wilcox Solar Observatory (WSO): and (2) an empirically derived global coronal density distribution using K coronal polarized brightness (pB) by MKIII in High Altitude Observator (HAO). The solar wind speed on the source surface is specified by the function of both f(s) and theta(b), which are obtained by the magnetic field data. Then the coronal mass outputs are analyzed and the self-consistent global distribution on the source surface is numerically studied for the four different phases. Finally, the model estimates the solar wind speed at 1 AU as a simple function of the speed on the source surface. Our numerical results indicate reasonable semi-quantitative agreement with observations at different phases of solar activity. (C) 2011 Elsevier Ltd. All rights reserved.
Indexed BySCI ; EI
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/122/3169
Collection空间科学部
Corresponding AuthorShen, F (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Shen, Fang,Feng, Xueshang,Xiang, Changqing,et al. Improvement to the global distribution of coronal plasma and magnetic field on the source surface using expansion factor f(s) and angular distance theta(b)[J]. JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,2012,77:125-131.
APA Shen, Fang,Feng, Xueshang,Xiang, Changqing,&Shen, F .(2012).Improvement to the global distribution of coronal plasma and magnetic field on the source surface using expansion factor f(s) and angular distance theta(b).JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,77,125-131.
MLA Shen, Fang,et al."Improvement to the global distribution of coronal plasma and magnetic field on the source surface using expansion factor f(s) and angular distance theta(b)".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 77(2012):125-131.
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