The evolution of the magnetic structures in electron phase-space holes: Two-dimensional particle-in-cell simulations
文献类型：期刊论文
| 作者 | Wu, Mingyu; Lu, Quanming; Du, Aimin; Xie, Jinlin; Wang, Shui |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
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| 出版日期 | 2011 |
| 卷号 | 116页码:A10208 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Wu, MY (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Basic Plasma Phys, Hefei 230026, Peoples R China. |
| 中文摘要 | Observations have shown that electron phase-space holes (electron holes) possess regular magnetic structures. In this paper, two-dimensional (2D) electromagnetic particle-in-cell (PIC) simulations are performed in the (x, y) plane to study magnetic structures associated with electron holes under different plasma conditions. In the simulations, the background magnetic field (B(0) = B(0)(e(x)) over right arrow) is along the x direction. The combined actions between the transverse instability and stabilization by the background magnetic field lead to the generation of the electric field E(y). Then electrons suffer the electric field drift and produce the current in the z direction, which leads to the fluctuating magnetic field along the x and y directions. Meanwhile, the motion of the electron holes along the x direction and the existence of the electric field E(y) generate the fluctuating magnetic field along the z direction. In very weakly magnetized plasma (Omega(e) << omega(pe), where Omega(e) and omega(pe) are the electron gyrofrequency and electron plasma frequency, respectively.), the transverse instability is very strong and the magnetic structures associated with electron holes disappear quickly. When Omega(e) is comparable to omega(pe), the parallel cut of the fluctuating magnetic field delta B(x) and delta B(z) has unipolar structures in the electron holes, while the parallel cut of fluctuating magnetic field delta B(y) has bipolar structures. In strongly magnetized plasma (Omega(e) > omega(pe)), electrostatic whistler waves with streaked structures of E(y) are excited. The fluctuating magnetic field delta B(x) and delta B(z) also have streaked structures. The relevance between our simulation results and the magnetic structures associated with electron holes observed in the plasma sheet is also discussed. |
| 英文摘要 | Observations have shown that electron phase-space holes (electron holes) possess regular magnetic structures. In this paper, two-dimensional (2D) electromagnetic particle-in-cell (PIC) simulations are performed in the (x, y) plane to study magnetic structures associated with electron holes under different plasma conditions. In the simulations, the background magnetic field (B(0) = B(0)(e(x)) over right arrow) is along the x direction. The combined actions between the transverse instability and stabilization by the background magnetic field lead to the generation of the electric field E(y). Then electrons suffer the electric field drift and produce the current in the z direction, which leads to the fluctuating magnetic field along the x and y directions. Meanwhile, the motion of the electron holes along the x direction and the existence of the electric field E(y) generate the fluctuating magnetic field along the z direction. In very weakly magnetized plasma (Omega(e) << omega(pe), where Omega(e) and omega(pe) are the electron gyrofrequency and electron plasma frequency, respectively.), the transverse instability is very strong and the magnetic structures associated with electron holes disappear quickly. When Omega(e) is comparable to omega(pe), the parallel cut of the fluctuating magnetic field delta B(x) and delta B(z) has unipolar structures in the electron holes, while the parallel cut of fluctuating magnetic field delta B(y) has bipolar structures. In strongly magnetized plasma (Omega(e) > omega(pe)), electrostatic whistler waves with streaked structures of E(y) are excited. The fluctuating magnetic field delta B(x) and delta B(z) also have streaked structures. The relevance between our simulation results and the magnetic structures associated with electron holes observed in the plasma sheet is also discussed. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 资助信息 | National Science Foundation of China (NSFC) [40974081, 40725013, 40931053]; Specialized Research Fund for State Key Laboratories; Fundamental Research Funds for the Central Universities [WK2080000010] |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3124]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Wu, Mingyu,Lu, Quanming,Du, Aimin,et al. The evolution of the magnetic structures in electron phase-space holes: Two-dimensional particle-in-cell simulations[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A10208. |
| APA | Wu, Mingyu,Lu, Quanming,Du, Aimin,Xie, Jinlin,&Wang, Shui.(2011).The evolution of the magnetic structures in electron phase-space holes: Two-dimensional particle-in-cell simulations.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A10208. |
| MLA | Wu, Mingyu,et al."The evolution of the magnetic structures in electron phase-space holes: Two-dimensional particle-in-cell simulations".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A10208. |
入库方式： OAI收割
来源：国家空间科学中心
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