| Revealing the sub-structures of the magnetic reconnection separatrix via particle-in-cell simulation | |
| Zhou, M.; Deng, X. H.; Pang, Y.; Huang, S. Y.; Yuan, Z. G.; Li, H. M.; Xu, X. J.; Wang, Y. H.; Yao, M.; Wang, D. D.; Zhou, M (reprint author), Nanchang Univ, Inst Space Sci & Technol, Nanchang 330031, Peoples R China. | |
| Department | 空间科学部 |
| Source Publication | PHYSICS OF PLASMAS
 |
| 2012 | |
| Volume | 19Issue:7Pages:72907 |
| ISSN | 1070-664X |
| Language | 英语 |
| Abstract | Magnetic separatrix is an important boundary layer separating the inflow and outflow regions in magnetic reconnection. In this article, we investigate the sub-structures of the separatrix region by using two-and-half dimensional electromagnetic particle-in-cell simulation. The separatrix region can be divided into two sub-regions in terms of the ion and electron frozen-in conditions. Far from the neutral sheet, ions and electrons are magnetized in magnetic fields. Approaching the neutral sheet, ion frozen-in condition is broken in a narrow region (similar to c/omega(pi)) at the edge of a density cavity, while electrons are frozen-in to magnetic fields. In this region, electric field E-z is around zero, and the convective term -(v(i) x B) is balanced by the Hall term in the generalized Ohm's law because ions carry the perpendicular current. Inside the density cavity, both ion and electron frozen-in conditions are broken. The region consists of two sub-ion or electron-scale layers, which contain intense electric fields. Formation of the two sub-layers is due to the complex electron flow pattern around the separatrix region. In the layer, E-z is balanced by a combination of Hall term and the divergence of electron pressure tensor, with the Hall term being dominant. Our preliminary simulation result shows that the separatrix region in guide field reconnection also contains two sub-regions: the inner region and the outer region. However, the inner region contains only one current layer in contrast with the case without guide field. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739283]; Magnetic separatrix is an important boundary layer separating the inflow and outflow regions in magnetic reconnection. In this article, we investigate the sub-structures of the separatrix region by using two-and-half dimensional electromagnetic particle-in-cell simulation. The separatrix region can be divided into two sub-regions in terms of the ion and electron frozen-in conditions. Far from the neutral sheet, ions and electrons are magnetized in magnetic fields. Approaching the neutral sheet, ion frozen-in condition is broken in a narrow region (similar to c/omega(pi)) at the edge of a density cavity, while electrons are frozen-in to magnetic fields. In this region, electric field E-z is around zero, and the convective term -(v(i) x B) is balanced by the Hall term in the generalized Ohm's law because ions carry the perpendicular current. Inside the density cavity, both ion and electron frozen-in conditions are broken. The region consists of two sub-ion or electron-scale layers, which contain intense electric fields. Formation of the two sub-layers is due to the complex electron flow pattern around the separatrix region. In the layer, E-z is balanced by a combination of Hall term and the divergence of electron pressure tensor, with the Hall term being dominant. Our preliminary simulation result shows that the separatrix region in guide field reconnection also contains two sub-regions: the inner region and the outer region. However, the inner region contains only one current layer in contrast with the case without guide field. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4739283] |
| Indexed By | SCI ; EI |
| Funding Project | 中国科学院空间科学与应用研究中心 |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/3076 |
| Collection | 空间科学部 |
| Corresponding Author | Zhou, M (reprint author), Nanchang Univ, Inst Space Sci & Technol, Nanchang 330031, Peoples R China. |
| Recommended Citation GB/T 7714 | Zhou, M.,Deng, X. H.,Pang, Y.,et al. Revealing the sub-structures of the magnetic reconnection separatrix via particle-in-cell simulation[J]. PHYSICS OF PLASMAS,2012,19(7):72907. |
| APA | Zhou, M..,Deng, X. H..,Pang, Y..,Huang, S. Y..,Yuan, Z. G..,...&Zhou, M .(2012).Revealing the sub-structures of the magnetic reconnection separatrix via particle-in-cell simulation.PHYSICS OF PLASMAS,19(7),72907. |
| MLA | Zhou, M.,et al."Revealing the sub-structures of the magnetic reconnection separatrix via particle-in-cell simulation".PHYSICS OF PLASMAS 19.7(2012):72907. |
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