Parallel Electron Heating by Tangential Discontinuity in the Turbulent Magnetosheath

被引：37

作者：

Liu, Y. Y. ^{[1
]}

Fu, H. S. ^{[1
]}

Liu, C. M. ^{[1
]}

Wang, Z. ^{[1
]}

Escoubet, P. ^{[2
]}

Hwang, K. -J. ^{[3
]}

Burch, J. L. ^{[3
]}

Giles, B. L. ^{[4
]}

机构：

[1] Beihang Univ, Sch Space & Environm, Beijing, Peoples R China

[2] European Space Agcy, Space Sci Dept, Noordwijk, Netherlands

[3] Southwest Res Inst, San Antonio, TX USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 877卷 / 02期

关键词：

acceleration of particles; magnetic reconnection; solar wind; turbulence; ROLLING-PIN DISTRIBUTION; MAGNETIC RECONNECTION; WHISTLER WAVES; ACCELERATION; MMS; SHEET; JETS; MODE;

D O I：

10.3847/2041-8213/ab1fe6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Energetic electrons exist widely in the turbulent magnetosheath, but how they are generated remains unclear. Here we report a new structure, at which electrons are efficiently accelerated in the direction parallel to the magnetic field. Such a structure, formed at the edge of a high-speed jet (HSJ), is a tangential discontinuity (TD) in the MHD regime, but exhibits impulsive fine structures in the kinetic-scale regime. The pulsation of the TD, caused by time-varying size of the HSJ, leads to the energization process: when the transverse section of the HSJ increases, a magnetic mirror is formed and subsequently electrons are trapped and accelerated via the Fermi mechanism; when the transverse section of the HSJ decreases, the magnetic mirror disappears and subsequently electrons escape. Such parallel electron heating can lead to three times of parallel-temperature increase; it can shed light on the study of electron heating in the solar wind, where TDs exist extensively.

引用

页数：6

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