Intermittent Dissipation at Kinetic Scales in Collisionless Plasma Turbulence

被引：171

作者：

Wan, M. ^{[1
,2
]}

Matthaeus, W. H. ^{[1
,2
]}

Karimabadi, H. ^{[3
,4
]}

Roytershteyn, V. ^{[4
]}

Shay, M. ^{[1
,2
]}

Wu, P. ^{[1
,2
]}

Daughton, W. ^{[5
]}

Loring, B. ^{[6
]}

Chapman, S. C. ^{[7
]}

机构：

[1] Univ Delaware, Bartol Res Inst, Newark, DE 19716 USA

[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA

[3] Univ Calif San Diego, La Jolla, CA 92093 USA

[4] SciberQuest Inc, Del Mar, CA 92014 USA

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

[6] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Berkeley, CA 94720 USA

[7] Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 19期

基金：

美国国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

SOLAR-WIND; EVOLUTION; FLUCTUATIONS;

D O I：

10.1103/PhysRevLett.109.195001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High resolution kinetic simulations of collisionless plasma driven by shear show the development of turbulence characterized by dynamic coherent sheetlike current density structures spanning a range of scales down to electron scales. We present evidence that these structures are sites for heating and dissipation, and that stronger current structures signify higher dissipation rates. Evidently, kinetic scale plasma, like magnetohydrodynamics, becomes intermittent due to current sheet formation, leading to the expectation that heating and dissipation in astrophysical and space plasmas may be highly nonuniform and patchy.

引用

页数：5

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