Study of small-scale plasmoid structures in the magnetotail using Cluster observations and Hall MHD simulations
文献类型：期刊论文
| 作者 | Chaoxu Liu
|
| 刊名 | Journal of Geophysical Research: Space Physics
 |
| 出版日期 | 2013 |
| 卷号 | 118期号:5页码:2087-2100 |
| 关键词 | plasmoid magnetotail Hall MHD |
| ISSN号 | 2169-9402 |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | The 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. |
| 学科主题 | 空间物理 |
| 语种 | 英语 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1521]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Chaoxu Liu. 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.(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."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. |
入库方式： OAI收割
来源：国家空间科学中心
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