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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Energy Dissipation via Magnetic Reconnection Within the Coherent Structures of the Magnetosheath Turbulence
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Energy Dissipation via Magnetic Reconnection Within the Coherent Structures of the Magnetosheath Turbulence

机译：通过磁重联能量耗散序结构内的磁鞘动荡

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摘要

A series of intermittent coherent structures was observed in magnetosheath turbulence in the form of magnetic peaks. These magnetic peaks are always accompanied with enhancement of local current density, and three of them are studied in detail because of their intense current density. Based on the magnetic field signals, magnetic curvatures, and the toroidal magnetic field lines, three peaks are identified as magnetic flux ropes. In each trailing part of these three peaks, an extremely thin electron current layer was embedded within a much broader ion-scale current layer. The energy dissipation is evident within the peaks and direct evidence of magnetic reconnection was found within the thinnest electron current layer. The electrons were heated mainly in two regions of magnetic peaks, that is,the reconnecting current layer by parallel electric field and the trailing edges by Fermi and betatron mechanisms. These results suggest that the ion-scale magnetic peaks are coherent structures associated with energy dissipation and electron heating in the magnetosheath. Thin current layers can be formed in magnetic peaks, and magnetic reconnection can play a significant role for the energy dissipation in magnetic peaks.
机译：一系列的断断续续的序结构观察到磁鞘形成湍流磁峰值。总是伴随着增强的地方电流密度,研究其中的3台细节,因为他们强烈的电流密度。基于磁场信号,磁性曲率,环形磁场行,三个山峰被确定为磁通量绳。山峰,一个极薄的电子当前层是嵌入在一个更广泛的ion-scale当前层。在高峰和磁场的直接证据重新连接在薄被发现电子当前层。主要集中在两个区域的磁山峰,是,重新连接当前层的平行电场和费米的后缘和电子感应加速器机制。ion-scale磁峰是一致的结构与能量耗散和电子加热磁鞘中。当前层可以形成磁峰,和磁重联可以扮演了一个重要的磁能量耗散的作用峰。

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