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Study of small-scale plasmoid structures in the magnetotail using Cluster observations and Hall MHD simulations
Chaoxu Liu; Xueshang Feng; Jianpeng Guo; Yudong Ye; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research: Space Physics
2013
Volume118Issue:5Pages:2087-2100
ISSN2169-9402
Language英语
KeywordPlasmoid Magnetotail Hall Mhd
AbstractThe existence of small-scale plasmoids associated with the Hall effect has been often observed in the magnetotail. They are considered as the signature of multiple X-line collisionless reconnection. To study these plasmoids structures, we present some Cluster observations and Hall MHD simulations of their features. In this study, the observation survey is divided into two types. The first one is the isolated plasmoid with two typical plasmoid events the flux-rope-like plasmoid on 3 August 2001 and the closed-loop-like plasmoid on 22 August 2001. The second type contains multiple successive plasmoids, on 12 September 2001 with three neighboring plasmoids structures observed during a substorm. Especially for the second plasmoid, three main features were observed, including a core field in the plasmoid, a quadrupole magnetic field near the X line, and a local plasma convection within the plasmoid. The Grad-Shafranov reconstruction method was used to recover the two-dimensional magnetic field maps for this plasmoid. These results may provide evidence that the small-scale plasmoids frequently observed in the magnetotail may be produced by multiple X-line collisionless reconnection. To study the impact of crosstail magnetic field on the structures of small-scale plasmoids, a 2.5-D Hall MHD simulation was performed. In the case with a guide field By0, the in-plane plasma inflows carrying Byflux enter into the plasmoid due to magnetic reconnection. However, there is no such By flux transport process for the case without guide field. These results demonstrate that a crosstail magnetic field is an important factor in the formation of flux-rope-like plasmoids.
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/122/1521
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Chaoxu Liu,Xueshang Feng,Jianpeng Guo,et al. Study of small-scale plasmoid structures in the magnetotail using Cluster observations and Hall MHD simulations[J]. Journal of Geophysical Research: Space Physics,2013,118(5):2087-2100.
APA Chaoxu Liu,Xueshang Feng,Jianpeng Guo,Yudong Ye,&北京8701信箱.(2013).Study of small-scale plasmoid structures in the magnetotail using Cluster observations and Hall MHD simulations.Journal of Geophysical Research: Space Physics,118(5),2087-2100.
MLA Chaoxu Liu,et al."Study of small-scale plasmoid structures in the magnetotail using Cluster observations and Hall MHD simulations".Journal of Geophysical Research: Space Physics 118.5(2013):2087-2100.
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