Inner plasma structure of the low-latitude reconnection layer
Inner plasma structure of the low-latitude reconnection layer
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低纬度重联层内部等离子体结构
DOI：
10.1029/2012ja017622
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发表时间：
2012-08
影响因子：
--
通讯作者：
J. A. Wild
中科院分区：
文献类型：
--
作者：
D. Constantinescu;M. Volwerk;H. Frey;A. N. Fazakerley;C. Shen;J.-K. Shi;D. Sibeck;P. Escoubet;J. A. Wild
我们报告了低纬度磁层顶重联层的明显转变，这表明在西北行星际磁场（IMF）条件下，所有重联磁力线都被完全穿越。相关的等离子体群体确认了电子和离子混合的细节以及通过当前层的时间历史和加速度。这种情况具有低磁剪切和强引导场，并且重连接层在磁鞘侧包含单个密度耗尽层，我们认为这是由几乎场对齐的磁鞘流产生的。在重联边界层内，有两个等离子体边界，靠近磁层和磁鞘侧（Ssp 和 Ssh）上推断的分离线，以及与阿尔文波（或旋转不连续性，RDsp 和 RDsh）相关的两个边界。这些数据与从重新连接站点发射的数据一致，并且等离子体分布井然有序，并暗示了自观察到的场线重新连接以来经过的时间。在边界之间的每个子层中，等离子体分布不同，并且以电流片为中心，负责磁鞘加速。我们展示了电子各向异性中速度色散效应的证据，该效应与重新连接后经过的时间一致。此外，还提出了磁层顶电流层磁鞘电子部分反射发生的新证据。
We report a clear transition through a reconnection layer at the low‐latitude magnetopause which shows a complete traversal across all reconnected field lines during northwestward interplanetary magnetic field (IMF) conditions. The associated plasma populations confirm details of the electron and ion mixing and the time history and acceleration through the current layer. This case has low magnetic shear with a strong guide field and the reconnection layer contains a single density depletion layer on the magnetosheath side which we suggest results from nearly field‐aligned magnetosheath flows. Within the reconnection boundary layer, there are two plasma boundaries, close to the inferred separatrices on the magnetosphere and magnetosheath sides (Ssp and Ssh) and two boundaries associated with the Alfvén waves (or Rotational Discontinuities, RDsp and RDsh). The data are consistent with these being launched from the reconnection site and the plasma distributions are well ordered and suggestive of the time elapsed since reconnection of the field lines observed. In each sub‐layer between the boundaries the plasma distribution is different and is centered around the current sheet, responsible for magnetosheath acceleration. We show evidence for a velocity dispersion effect in the electron anisotropy that is consistent with the time elapsed since reconnection. In addition, new evidence is presented for the occurrence of partial reflection of magnetosheath electrons at the magnetopause current layer.
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影响因子：
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作者：
J. Egedal;A. Le;N. Katz;L. Chen;B. Lefebvre;W. Daughton;A. Fazakerley
通讯作者：
J. Egedal;A. Le;N. Katz;L. Chen;B. Lefebvre;W. Daughton;A. Fazakerley
影响因子：
5.2
作者：
M. Hapgood;D. A. Bryant
通讯作者：
M. Hapgood;D. A. Bryant
影响因子：
--
作者：
K. Trattner;J. Mulcock;S. Petrinec;S. Fuselier
通讯作者：
K. Trattner;J. Mulcock;S. Petrinec;S. Fuselier
影响因子：
--
作者：
M. Lockwood
通讯作者：
M. Lockwood
影响因子：
--
作者：
Rongsheng Wang;Q. Lu;Can Huang;Shui Wang
通讯作者：
Rongsheng Wang;Q. Lu;Can Huang;Shui Wang