Electron Bulk Acceleration and Thermalization at Earth's Quasiperpendicular Bow Shock

被引：41

作者：

Chen, L. -J. ^{[1
,2
]}

Wang, S. ^{[1
,2
]}

Wilson, L. B., III ^{[1
]}

Schwartz, S. ^{[3
]}

Bessho, N. ^{[1
,2
]}

Moore, T. ^{[1
]}

Gershman, D. ^{[1
]}

Giles, B. ^{[1
]}

Malaspina, D. ^{[3
]}

Wilder, F. D. ^{[3
]}

Ergun, R. E. ^{[3
]}

Hesse, M. ^{[4
]}

Lai, H. ^{[5
]}

Russell, C. ^{[5
]}

Strangeway, R. ^{[5
]}

Torbert, R. B. ^{[6
]}

Vinas, A. F. - ^{[1
]}

Burch, J. ^{[6
]}

Lee, S. ^{[1
]}

Pollock, C. ^{[7
]}

Dorelli, J. ^{[1
]}

Paterson, W. ^{[1
]}

Ahmadi, N. ^{[3
]}

Goodrich, K. ^{[3
]}

Lavraud, B. ^{[8
]}

Le Contel, O. ^{[9
]}

Khotyaintsev, Yu. V. ^{[10
]}

Lindqvist, P. -A. ^{[11
]}

Boardsen, S. ^{[1
,2
]}

Wei, H. ^{[5
]}

Le, A. ^{[12
]}

Avanov, L. ^{[1
,2
]}

机构：

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

[2] Univ Maryland, Dept Astron, College Pk, MD 20747 USA

[3] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80305 USA

[4] Univ Bergen, N-5020 Bergen, Norway

[5] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

[6] Southwest Res Inst, San Antonio, TX 78238 USA

[7] Denali Sci, Healy, AK 99743 USA

[8] Univ Toulouse UPS, Inst Rech Astrophys & Planetol, CNRS, CNES, F-31028 Toulouse 4, France

[9] Univ Paris Sud, Observ Paris, Lab Phys Plasmas, UMR7648,CNRS,Ecole Polytech,Sorbonne Univ, F-91128 Palaiseau, France

[10] Swedish Inst Space Phys, SE-75121 Uppsala, Sweden

[11] KTH Royal Inst Technol, SE-11428 Stockholm, Sweden

[12] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 22期

关键词：

COLLISIONLESS SHOCK; MACH NUMBER; DISTRIBUTIONS; DEMAGNETIZATION; INSTABILITIES; MECHANISM; WAVES; BETA;

D O I：

10.1103/PhysRevLett.120.225101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Electron heating at Earth's quasiperpendicular bow shock has been surmised to be due to the combined effects of a quasistatic electric potential and scattering through wave-particle interaction. Here we report the observation of electron distribution functions indicating a new electron heating process occurring at the leading edge of the shock front. Incident solar wind electrons are accelerated parallel to the magnetic field toward downstream, reaching an electron-ion relative drift speed exceeding the electron thermal speed. The bulk acceleration is associated with an electric field pulse embedded in a whistler-mode wave. The high electron-ion relative drift is relaxed primarily through a nonlinear current-driven instability. The relaxed distributions contain a beam traveling toward the shock as a remnant of the accelerated electrons. Similar distribution functions prevail throughout the shock transition layer, suggesting that the observed acceleration and thermalization is essential to the cross-shock electron heating.

引用

页数：6

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