The magnetic structures of electron phase-space holes formed in the electron two-stream instability
文献类型：期刊论文
| 作者 | Wu, Mingyu; Lu, Quanming; Zhu, Jie; Du, Aimin; Wang, Shui |
| 刊名 | ASTROPHYSICS AND SPACE SCIENCE
 |
| 出版日期 | 2012 |
| 卷号 | 338期号:1页码:81-85 |
| 关键词 | Electron phase-space hole Magnetic structure Particle-in-cell stimulation The transverse instability |
| ISSN号 | 0004-640X |
| 通讯作者 | Lu, QM (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei 230026, Anhui, Peoples R China. |
| 中文摘要 | It is well known that the parallel cuts of the parallel and perpendicular electric field in electron phase-space holes (electron holes) have bipolar and unipolar structures, respectively. Recently, electron holes in the Earth's plasma sheet have been observed by THEMIS satellites to have detectable fluctuating magnetic field with regular structures. Du et al. (2011) investigated the evolution of a one-dimensional (1D) electron hole with two-dimensional (2D) electromagnetic particle-in-cell (PIC) simulations in weakly magnetized plasma (Omega(epsilon) < omega(pe), where Omega(e) and omega(pe) are the electron gyrofrequency and electron plasma frequency, respectively), which initially exists in the simulation domain. The electron hole is unstable to the transverse instability and broken into several 2D electron holes. They successfully explained the observations by THEMIS satellites based on the generated magnetic structures associated with these 2D electron holes. In this paper, 2D electromagnetic particle-in-cell (PIC) simulations are performed in the x-y plane to investigate the nonlinear evolution of the electron two-stream instability in weakly magnetized plasma, where the background magnetic field (B-0 = B-0<(e)over right arrow>(x)) is along the x direction. Several 2D electron holes are formed during the nonlinear evolution, where the parallel cuts of E-x and E-y have bipolar and unipolar structures, respectively. Consistent with the results of Du et al. (2011), we found that the current along the z direction is generated by the electric field drift motion of the trapped electrons in the electron holes due to the existence of E-y, which produces the fluctuating magnetic field delta B-x and delta B-y in the electron holes. The parallel cuts of delta Bx and delta B-y in the electron holes have unipolar and bipolar structures, respectively. |
| 英文摘要 | It is well known that the parallel cuts of the parallel and perpendicular electric field in electron phase-space holes (electron holes) have bipolar and unipolar structures, respectively. Recently, electron holes in the Earth's plasma sheet have been observed by THEMIS satellites to have detectable fluctuating magnetic field with regular structures. Du et al. (2011) investigated the evolution of a one-dimensional (1D) electron hole with two-dimensional (2D) electromagnetic particle-in-cell (PIC) simulations in weakly magnetized plasma (Omega(epsilon) < omega(pe), where Omega(e) and omega(pe) are the electron gyrofrequency and electron plasma frequency, respectively), which initially exists in the simulation domain. The electron hole is unstable to the transverse instability and broken into several 2D electron holes. They successfully explained the observations by THEMIS satellites based on the generated magnetic structures associated with these 2D electron holes. In this paper, 2D electromagnetic particle-in-cell (PIC) simulations are performed in the x-y plane to investigate the nonlinear evolution of the electron two-stream instability in weakly magnetized plasma, where the background magnetic field (B-0 = B-0<(e)over right arrow>(x)) is along the x direction. Several 2D electron holes are formed during the nonlinear evolution, where the parallel cuts of E-x and E-y have bipolar and unipolar structures, respectively. Consistent with the results of Du et al. (2011), we found that the current along the z direction is generated by the electric field drift motion of the trapped electrons in the electron holes due to the existence of E-y, which produces the fluctuating magnetic field delta B-x and delta B-y in the electron holes. The parallel cuts of delta Bx and delta B-y in the electron holes have unipolar and bipolar structures, respectively. |
| 学科主题 | 空间物理 |
| 收录类别 | SCI |
| 资助信息 | National Science Foundation of China (NSFC) [41128004, 40725013, 40974081]; State Oceanic Administration People's Republic of China [201005017]; 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/122/3123]  |
| 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,Zhu, Jie,et al. The magnetic structures of electron phase-space holes formed in the electron two-stream instability[J]. ASTROPHYSICS AND SPACE SCIENCE,2012,338(1):81-85. |
| APA | Wu, Mingyu,Lu, Quanming,Zhu, Jie,Du, Aimin,&Wang, Shui.(2012).The magnetic structures of electron phase-space holes formed in the electron two-stream instability.ASTROPHYSICS AND SPACE SCIENCE,338(1),81-85. |
| MLA | Wu, Mingyu,et al."The magnetic structures of electron phase-space holes formed in the electron two-stream instability".ASTROPHYSICS AND SPACE SCIENCE 338.1(2012):81-85. |
入库方式： OAI收割
来源：国家空间科学中心
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。