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The magnetic structures of electron phase-space holes formed in the electron two-stream instability
Wu, Mingyu; Lu, Quanming; Zhu, Jie; Du, Aimin; Wang, Shui; Lu, QM (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei 230026, Anhui, Peoples R China.
Department空间科学部
Source PublicationASTROPHYSICS AND SPACE SCIENCE
2012
Volume338Issue:1Pages:81-85
ISSN0004-640X
Language英语
KeywordElectron Phase-space Hole Magnetic Structure Particle-in-cell Stimulation The Transverse Instability
AbstractIt 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.; 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3123
Collection空间科学部
Corresponding AuthorLu, QM (reprint author), Univ Sci & Technol China, Dept Geophys & Planetary Sci, Hefei 230026, Anhui, Peoples R China.
Recommended Citation
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,&Lu, QM .(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.
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