磁鞘射流周围的规模估计和流动模式识别

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Adrian Pöppelwerth, Georg Glebe, J. Mieth, F. Koller, T. Karlsson, Z. Vörös, Ferdinand Plaschke
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引用次数: 0

摘要

摘要动压的瞬时增强,即所谓的磁鞘射流或简称射流,在磁鞘中大量存在。它们从弓形冲击穿过磁鞘,向磁层顶移动。在穿过磁鞘的过程中,射流会扰动周围的等离子体。已有多项研究对其垂直于传播方向的尺度大小进行了研究,而且几乎都是以统计方式进行的。在本文中,我们利用亚暴期间事件和宏观尺度相互作用时间历程(THEMIS)任务的多点测量来研究单个射流的通过。本文介绍的方法使我们能够估算出喷流内部动压的空间分布。此外,还可以估算出不同横截面上垂直于传播方向的尺寸。在本文研究的射流事件中,动压和垂直于射流方向的尺寸都沿着传播轴从射流的前部向中心增加,然后再向后部减少,但既不是单调的,也不是对称的。我们得到垂直方向的最大直径约为 1 RE,喷流中心的动压约为 6 nPa。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Scale size estimation and flow pattern recognition around a magnetosheath jet
Abstract. Transient enhancements in the dynamic pressure, so-called magnetosheath jets or simply jets, are abundantly found in the magnetosheath. They travel from the bow shock through the magnetosheath towards the magnetopause. On their way through the magnetosheath, jets disturb the ambient plasma. Multiple studies already investigated their scale size perpendicular to their propagation direction, and almost exclusively in a statistical manner. In this paper, we use multi-point measurements from the Time History of Events and Macroscale Interactions during Substorms (THEMIS) mission to study the passage of a single jet. The method described here allows us to estimate the spatial distribution of the dynamic pressure within the jet. Furthermore, the size perpendicular to the propagation direction can be estimated for different cross sections. In the jet event investigated here, both the dynamic pressure and the perpendicular size increase along the propagation axis from the front part towards the center of the jet and decrease again towards the rear part, but neither monotonically nor symmetrically. We obtain a maximum diameter in the perpendicular direction of about 1 RE and a dynamic pressure of about 6 nPa at the jet center.
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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