Dipolarization fronts as earthward propagating flux ropes: A three-dimensional global hybrid simulation
文献类型：期刊论文
| 作者 | Lu, San1,2; Lu, Quanming1,2; Lin, Yu3; Wang, Xueyi3; Ge, Yasong4; Wang, Rongsheng4; Zhou, Meng5; Fu, Huishan6; Huang, Can1; Wu, Mingyu1 |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2015-08-01 |
| 卷号 | 120期号:8页码:6286-6300 |
| 关键词 | dipolarization fronts flux ropes three-dimensional global hybrid simulation |
| DOI | 10.1002/2015JA021213 |
| 文献子类 | Article |
| 英文摘要 | Dipolarization fronts (DFs) as earthward propagating flux ropes (FRs) in the Earth's magnetotail are presented and investigated with a three-dimensional (3-D) global hybrid simulation for the first time. In the simulation, several small-scale earthward propagating FRs are found to be formed by multiple X line reconnection in the near tail. During their earthward propagation, the magnetic field B-z of the FRs becomes highly asymmetric due to the imbalance of the reconnection rates between the multiple X lines. At the later stage, when the FRs approach the near-Earth dipole-like region, the antireconnection between the southward/negative B-z of the FRs and the northward geomagnetic field leads to the erosion of the southward magnetic flux of the FRs, which further aggravates the B-z asymmetry. Eventually, the FRs merge into the near-Earth region through the antireconnection. These earthward propagating FRs can fully reproduce the observational features of the DFs, e.g., a sharp enhancement of B-z preceded by a smaller amplitude B-z dip, an earthward flow enhancement, the presence of the electric field components in the normal and dawn-dusk directions, and ion energization. Our results show that the earthward propagating FRs can be used to explain the DFs observed in the magnetotail. The thickness of the DFs is on the order of several ion inertial lengths, and the electric field normal to the front is found to be dominated by the Hall physics. During the earthward propagation from the near-tail to the near-Earth region, the speed of the FR/DFs increases from similar to 150km/s to similar to 1000km/s. The FR/DFs can be tilted in the GSM (x,y) plane with respect to the y (dawn-dusk) axis and only extend several Earth radii in this direction. Moreover, the structure and evolution of the FRs/DFs are nonuniform in the dawn-dusk direction, which indicates that the DFs are essentially 3-D. |
| WOS关键词 | CORE FIELD GENERATION ; MAGNETIC RECONNECTION ; ELECTRON ACCELERATION ; PARTICLE SIMULATIONS ; CURRENT SHEET ; PLASMA SHEET ; MAGNETOTAIL ; CLUSTER ; ENERGIZATION ; FLOW |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000362125300018 |
| 资助机构 | 973 Program(2012CB825602 ; 973 Program(2012CB825602 ; National Science Foundation of China(41474125 ; National Science Foundation of China(41474125 ; CAS(KZZD-EW-01-4) ; CAS(KZZD-EW-01-4) ; NSF(AGS 1405225) ; NSF(AGS 1405225) ; 2013CBA01503) ; 2013CBA01503) ; 41331067 ; 41331067 ; 11235009 ; 11235009 ; 41274124 ; 41274124 ; 41274144 ; 41274144 ; 41121003) ; 41121003) ; 973 Program(2012CB825602 ; 973 Program(2012CB825602 ; National Science Foundation of China(41474125 ; National Science Foundation of China(41474125 ; CAS(KZZD-EW-01-4) ; CAS(KZZD-EW-01-4) ; NSF(AGS 1405225) ; NSF(AGS 1405225) ; 2013CBA01503) ; 2013CBA01503) ; 41331067 ; 41331067 ; 11235009 ; 11235009 ; 41274124 ; 41274124 ; 41274144 ; 41274144 ; 41121003) ; 41121003) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/62222]  |
| 专题 | 地质与地球物理研究所_中国科学院地球与行星物理重点实验室 |
| 作者单位 | 1.Univ Sci & Technol China, Dept Geophys & Planetary Sci, CAS Key Lab Geospace Environm, Hefei 230026, Peoples R China 2.Collaborat Innovat Ctr Astronaut Sci & Technol, Harbin, Peoples R China 3.Auburn Univ, Dept Phys, Auburn, AL 36849 USA 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China 5.Nanchang Univ, Inst Space Sci & Technol, Nanchang, Peoples R China 6.Beihang Univ, Sch Astronaut, Space Sci Inst, Beijing 100191, Peoples R China |
| 推荐引用方式 GB/T 7714 | Lu, San,Lu, Quanming,Lin, Yu,et al. Dipolarization fronts as earthward propagating flux ropes: A three-dimensional global hybrid simulation[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(8):6286-6300. |
| APA | Lu, San.,Lu, Quanming.,Lin, Yu.,Wang, Xueyi.,Ge, Yasong.,...&Wang, Shui.(2015).Dipolarization fronts as earthward propagating flux ropes: A three-dimensional global hybrid simulation.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(8),6286-6300. |
| MLA | Lu, San,et al."Dipolarization fronts as earthward propagating flux ropes: A three-dimensional global hybrid simulation".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.8(2015):6286-6300. |
入库方式： OAI收割
来源：地质与地球物理研究所
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