| The magnetic configuration of the high-latitude cusp and dayside magnetopause under strong magnetic shears | |
| Shen, C.; Dunlop, M.; Ma, Y. H.; Chen, Z. Q.; Yan, G. Q.; Liu, Z. X.; Bogdanova, Y. V.; Sibeck, D. G.; Carr, C. M.; Zhang, Q. H.; Lucek, E.; Shen, C (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, 1 Nanertiao, Beijing 100190, Peoples R China. | |
| Department | 空间科学部 |
| Source Publication | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 2011 | |
| Volume | 116Pages:A09228 |
| ISSN | 2169-9380 |
| Language | 英语 |
| Abstract | This paper investigates the structure of the magnetic field near the magnetopause (MP) by analyzing the multiple-point magnetic measurements from the Cluster mission. In this paper, the spatial distribution of the curvature radius of the MP surface at the noon-midnight meridian and for situations with moderate dynamical pressure of solar wind is implied from direct measurements of magnetic field curvature for the first time. The investigation focused on conditions of strong magnetic shear and in which a clear boundary layer is present at the MP. It has been confirmed that the magnetic field lines surrounding the cusp bend sunward at the precusp region and tailward at the postcusp region, implying the existence of a cusp field indentation. The minimum curvature radius of the near-MP field at both precusp and postcusp regions is about 2 R-E. As the latitude decreases, the curvature radius at the MP increases gradually, so that, as the subsolar point is approached, the curvature radius of the MP is nearly equal to the geocentric distance. These results compare well with existing MP models but reveal the limitations inherent in such statistical estimates of local MP curvature, particularly surrounding the cusp regions. The analysis of the magnetic measurements has also verified the existence of the magnetic bottles at both precusp and postcusp regions, which may play a role for the trapping of the charged particles of magnetosphere.; This paper investigates the structure of the magnetic field near the magnetopause (MP) by analyzing the multiple-point magnetic measurements from the Cluster mission. In this paper, the spatial distribution of the curvature radius of the MP surface at the noon-midnight meridian and for situations with moderate dynamical pressure of solar wind is implied from direct measurements of magnetic field curvature for the first time. The investigation focused on conditions of strong magnetic shear and in which a clear boundary layer is present at the MP. It has been confirmed that the magnetic field lines surrounding the cusp bend sunward at the precusp region and tailward at the postcusp region, implying the existence of a cusp field indentation. The minimum curvature radius of the near-MP field at both precusp and postcusp regions is about 2 R-E. As the latitude decreases, the curvature radius at the MP increases gradually, so that, as the subsolar point is approached, the curvature radius of the MP is nearly equal to the geocentric distance. These results compare well with existing MP models but reveal the limitations inherent in such statistical estimates of local MP curvature, particularly surrounding the cusp regions. The analysis of the magnetic measurements has also verified the existence of the magnetic bottles at both precusp and postcusp regions, which may play a role for the trapping of the charged particles of magnetosphere. |
| Indexed By | SCI |
| Funding Project | 中国科学院空间科学与应用研究中心 |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/3177 |
| Collection | 空间科学部 |
| Corresponding Author | Shen, C (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, 1 Nanertiao, Beijing 100190, Peoples R China. |
| Recommended Citation GB/T 7714 | Shen, C.,Dunlop, M.,Ma, Y. H.,et al. The magnetic configuration of the high-latitude cusp and dayside magnetopause under strong magnetic shears[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A09228. |
| APA | Shen, C..,Dunlop, M..,Ma, Y. H..,Chen, Z. Q..,Yan, G. Q..,...&Shen, C .(2011).The magnetic configuration of the high-latitude cusp and dayside magnetopause under strong magnetic shears.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A09228. |
| MLA | Shen, C.,et al."The magnetic configuration of the high-latitude cusp and dayside magnetopause under strong magnetic shears".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A09228. |
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