Evidence for the dissipation region in magnetotail reconnection
Evidence for the dissipation region in magnetotail reconnection
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DOI：
10.1029/2012gl051938
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发表时间：
2012-05
影响因子：
5.2
通讯作者：
S. Zenitani;I. Shinohara;T. Nagai
中科院分区：
文献类型：
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作者：
S. Zenitani;I. Shinohara;T. Nagai
GeoTail航天器研究了2003年5月15日事件中无碰撞磁重联的耗散区的特征。电子体流静止标架中的能量耗散以近似的de*形式被考虑，并通过粒子在单元中的模拟得到验证。耗散度量直接从等离子体矩、电场和磁场来评估。利用De*，在GeoTail数据中可能的X点附近成功地探测到一个致密的耗散区。耗散率为45pwm−3。耗散区的长度估计为1-2dioc(局域离子惯性长度)。文中还介绍了洛伦兹力对等离子体的功W。它在重联区上方为正值，并且在远离X点的堆积区周围有一个峰值。这些新的度量De*和W为理解重新连接结构提供了有用的信息。
Signatures of the dissipation region of collisionless magnetic reconnection are investigated by the Geotail spacecraft for the 15 May 2003 event. The energy dissipation in the rest frame of the electron's bulk flow is considered in an approximate form De*, which is validated by a particle‐in‐cell simulation. The dissipation measure is directly evaluated from the plasma moments, the electric field, and the magnetic field. UsingDe*, a compact dissipation region is successfully detected in the vicinity of the possible X‐point in Geotail data. The dissipation rate is 45 pWm−3. The length of the dissipation region is estimated to 1–2diloc (local ion inertial length). The Lorentz work W, the work rate by Lorentz force to plasmas, is also introduced. It is positive over the reconnection region and it has a peak around the pileup region away from the X‐point. These new measuresDe* and W provide useful information to understand the reconnection structure.