An Encounter With the Ion and Electron Diffusion Regions at a Flapping and Twisted Tail Current Sheet

C. J. Farrugia; A. J. Rogers; R. B. TorbertK. J. GenestretiT. K. M. NakamuraB. LavraudP. MontagJ. EgedalD. PayneA. KeeseeN. AhmadiR. ErgunP. ReiffM. ArgallH. MatsuiL. B. Wilson IIIN. LugazJ. L. BurchC. T. RussellS. A. FuselierI. Dors

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An Encounter With the Ion and Electron Diffusion Regions at a Flapping and Twisted Tail Current Sheet

机译：一个遇到的离子和电子的扩散地区在拍打和扭曲的尾电流表

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We analyze data returned by the Magnetospheric Multiscale mission (MMS) constellation during a rapid (~1.5 s) traversal of a flapping and reconnecting current sheet (CS) in the near-Earth magnetotail (X ~-20 RE). The CS was highly tilted, with its normal pointing strongly duskward. Its extreme thinness was confirmed by a curvature analysis of the magnetic field lines. The event was associated with a guide field of 8% of the reconnecting components. From the pitch angle distributions of low-energy electrons we infer a crossing earthward of the X-line. Traveling practically normal to the CS, MMS encountered an ion diffusion region (IDR) in which was embedded an electron diffusion region (EDR). IDR signatures included breaking of the ion frozen-in condition in the presence of Hall B and E fields. EDR signatures included a strong out-of-plane current associated with a superAlfvénic electron jet, positive energy transfer, and a temperature anisotropy (Te_∥ > Te_⊥) which disappeared at the field reversal. Derived scale sizes normal to the CS are: ~6.9 de (EDR) and ~0.4 di (IDR; 40 and 100 km). We estimate the average dimensionless reconnection rate as 0.077 ± 0.050. The observations and inferences are supported by particle-in-cell (PIC) numerical simulations. We find very good agreement in the reconnection rates. We also discuss the effects of asymmetries in the density, temperature and magnetic field strength on the Hall fields and length of the outflow jets. The event is associated with a substorm onset which began 7 min after the MMS observations.

机译：我们分析磁性层的返回的数据多尺度任务期间(MMS)星座快速(~ 1.5 s)遍历的拍打在近地重新连接电流片(CS)磁尾(X ~ -20 RE)。倾斜的,正常的强烈duskward。磁场线的曲率分析。事件与导游相关领域的8%重新连接的组件。低能电子的角分布推断出x轴的交叉向地面。CS旅行几乎正常,MMS遇到一个离子扩散区域(IDR)这是嵌入式电子扩散区域(EDR)。B离子冻结在条件的大厅和E字段。平面外电流有关superAlfvenic电子喷射,积极的能量转移和温度各向异性(Te_∥>场逆转Te_⊥)消失。派生的规模大小正常CS: ~ 6.9德di (EDR) ~ 0.4 (IDR;估计平均无量纲重新连接率为0.077±0.050。推断受到particle-in-cell的支持(图片)数值模拟。协议的重联率。讨论了不对称的影响密度、温度和磁场强度在大厅字段和流出的长度飞机。MMS后发作始于7分钟观察。

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2021年第3期|e2020JA028903-1-e2020JA028903-23|共23页
作者
C. J. Farrugia; A. J. Rogers; R. B. TorbertK. J. GenestretiT. K. M. NakamuraB. LavraudP. MontagJ. EgedalD. PayneA. KeeseeN. AhmadiR. ErgunP. ReiffM. ArgallH. MatsuiL. B. Wilson IIIN. LugazJ. L. BurchC. T. RussellS. A. FuselierI. Dors;
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Department of Physics and Astronomy and Space Science Center, University of New Hampshire, Durham, NH, USA;

Southwest Research Institute, Durham, NH, USA;

Institute of Physics, University of Graz, Graz, Austria,Institut de Recherche en Astrophysique et Planetologie, Universite de Toulouse, Toulouse, FranceUniversity of Wisconsin-Madison, Madison, WI, USA,University of Colorado LASP, Boulder, CO, USANASA Goddard Space Flight Center, Greenbelt, MD, USA,Department of Earth and Space Sciences, University of California, LA, USA;

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正文语种英语
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ENCOUNTERS; flapping; Ionsfield reversalelectron diffusioncurrent sheetHall fieldangle of pitch;

机译：遇到,拍动;Ionsfield reversalelectrondiffusioncurrent sheetHall fieldangle音高;

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An Encounter With the Ion and Electron Diffusion Regions at a Flapping and Twisted Tail Current Sheet

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