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The evolution of the magnetic structures in electron phase-space holes: Two-dimensional particle-in-cell simulations
Wu, Mingyu; Lu, Quanming; Du, Aimin; Xie, Jinlin; Wang, Shui; Wu, MY (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Basic Plasma Phys, Hefei 230026, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A10208
ISSN0148-0227
Language英语
AbstractObservations 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.; 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.
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/122/3124
Collection空间科学部
Corresponding AuthorWu, MY (reprint author), Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Basic Plasma Phys, Hefei 230026, Peoples R China.
Recommended Citation
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,&Wu, MY .(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.
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