Statistical Characteristics of Electron Vortexes in the Terrestrial Magnetosheath

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Z. Wang, S. Y. Huang, Z. G. Yuan, Y. Y. Wei, K. Jiang, S. B. Xu, J. Zhang, R. T. Lin, L. Yu, Q. Y. Xiong, C. M. Wang
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Abstract

Abstract Utilizing the unprecedented high-resolution Magnetospheric Multiscale mission data from 2015 September to 2017 December, we perform a statistical study of electron vortexes in the turbulent terrestrial magnetosheath. On the whole, 506 electron vortex events are successfully selected. Electron vortexes can occur at four known types of magnetic structures, including 78, 42, 26, and 39 electron vortexes observed during the crossings of the current sheets, magnetic holes, magnetic peaks, and flux ropes, respectively. Except for the four types of structures, the rest of the electron vortexes are in the “Others” category, defined as unknown structures. The electron vortexes mainly occur in the subsolar region, with only a few in the flank region. The total occurrence rate of all electron vortexes is 4.86 hr –1 , with, on average, 3.65 events hr −1 in the X-Y plane and 3.26 events hr −1 in the X-Z plane. The durations of most of the electron vortexes concentrate within 0.5–1.5 s and are 1.09 s on average. The electron vortexes are ion-scale structures owing to the average scale of 2.05 ion gyroradius. In addition, the means, medians, and maxima of the energy dissipation J · E ′ in the electron vortexes are almost positive, implying that the electron vortex may be a potential coherent structure or channel for turbulent energy dissipation. All these results reveal the statistical characteristics of electron vortexes in the magnetosheath and improve our understanding of energy dissipation in astrophysical and space plasmas.
地球磁鞘中电子涡的统计特征
利用2015年9月至2017年12月前所未有的高分辨率磁层多尺度任务数据,对湍流地球磁鞘中的电子涡进行了统计研究。总的来说,成功地选择了506个电子涡事件。电子涡可以发生在四种已知的磁结构中,分别在电流片、磁孔、磁峰和磁绳的交叉处观察到78、42、26和39个电子涡。除了这四种类型的结构外,其余的电子漩涡都属于“其他”类别,定义为未知结构。电子涡主要出现在太阳亚区,只有少数电子涡出现在太阳翼区。所有电子涡的总发生率为4.86 hr -1,平均在X-Y平面上有3.65个事件hr -1,在X-Z平面上有3.26个事件hr -1。电子涡的持续时间大部分集中在0.5 ~ 1.5 s之间,平均为1.09 s。电子涡旋的平均尺度为2.05离子回旋半径,属于离子尺度结构。此外,电子涡的能量耗散J·E '的均值、中位数和最大值几乎为正,表明电子涡可能是一种潜在的相干结构或湍流能量耗散通道。这些结果揭示了磁鞘中电子涡的统计特征,提高了我们对天体物理和空间等离子体能量耗散的认识。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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