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)
文献类型：期刊论文
| 作者 | Shen, Fang; Feng, Xueshang; Xiang, Changqing |
| 刊名 | JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
 |
| 出版日期 | 2012 |
| 卷号 | 77页码:125-131 |
| 关键词 | Global coronal plasma and field distribution Expansion factor f(s) Angular distance theta(b) |
| ISSN号 | 1364-6826 |
| 通讯作者 | Shen, F (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China. |
| 中文摘要 | 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. |
| 英文摘要 | 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. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI ; EI |
| 资助信息 | National Natural Science Foundation of China [40921063, 41074121, 41174150, 41031066, 40874077, 40890162, 40874091]; 973 project [2012CB825601]; Specialized Research Fund for State Key Laboratories and the Public Science and Technology Research Funds Projects of Ocean [201005017] |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3169]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Shen, Fang,Feng, Xueshang,Xiang, Changqing. 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.(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. |
入库方式： OAI收割
来源：国家空间科学中心
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