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A mechanism for electrostatic solitary waves observed in the reconnection jet region of the Earth’s magnetotail
Advances in Space Research ( IF 2.6 ) Pub Date : 2021-04-24 , DOI: 10.1016/j.asr.2021.04.026
G.S. Lakhina , S.V. Singh , R. Rubia

Electrostatic solitary waves (ESWs) have been observed in the reconnection jet region in the Earth’s magnetotail by the Magnetospheric Multiscale spacecraft (MMS). A mechanism for the reconnection jet ESWs is proposed in terms of slow and fast ion-acoustic solitons. At the time of occurrence of ESWs, no hot plasmasheet ions were observed. Based on the observations, the reconnection jet plasma is modeled by a three-component magnetized plasma consisting of hot electrons and two cold ion beams streaming parallel and anti-parallel to the magnetic field, B respectively. The model is based on the Sagdeev pseudopotential technique, and it predicts four types of ion-acoustic solitons, namely, two fast and two slow ion-acoustic solitons, where one of each type propagates parallel and another anti-parallel to the ambient magnetic field, respectively. The theoretical model predicts bipolar electric fields with amplitudes in the range of (3–69) mV m−1, positive potentials with amplitudes of (51–539) V, and the soliton widths of (4.5–10.3) Debye lengths. These predictions are in good agreement with the observed characteristics of ESWs in the reconnection jet region.



中文翻译:

在地球磁尾重联喷射区观测到的静电孤波机制

磁层多尺度航天器 (MMS) 已在地球磁尾的重联喷射区观测到静电孤立波 (ESW)。根据慢速和快速离子声孤子提出了一种重新连接射流 ESW 的机制。在 ESW 发生时,没有观察到热等离子体片离子。根据观察,重联射流等离子体由三分量磁化等离子体建模,该等离子体由热电子和两个冷离子束组成,平行和反平行于磁场流动,分别。该模型基于 Sagdeev 赝势技术,它预测了四种类型的离子声孤子,即两种快离子声孤子和两种慢速离子声孤子,其中每种类型中的一种平行于环境磁场传播,另一种反向平行于环境磁场, 分别。理论模型预测幅度在范围内的双极电场(3–69) mV m -1,振幅为 (51–539) V,以及孤子宽度 (4.5–10.3) 德拜长度。这些预测与在重联射流区域观察到的 ESW 特征非常一致。

更新日期:2021-06-30
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