Statistics of Kinetic Dissipation in the Earth's Magnetosheath: MMS Observations

被引：49

作者：

Bandyopadhyay, Riddhi ^{[1
]}

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

Parashar, Tulasi N. ^{[1
,10
]}

Yang, Yan ^{[3
]}

Chasapis, Alexandros ^{[4
]}

Giles, Barbara L. ^{[5
]}

Gershman, Daniel J. ^{[5
]}

Pollock, Craig J. ^{[6
]}

Russell, Christopher T. ^{[7
]}

Strangeway, Robert J. ^{[7
]}

Torbert, Roy B. ^{[8
]}

Moore, Thomas E. ^{[5
]}

Burch, James L. ^{[9
]}

机构：

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

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

[3] Southern Univ Sci & Technol, Shenzhen 518055, Guangdong, Peoples R China

[4] Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

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

[6] Denali Sci, Fairbanks, AK 99709 USA

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

[8] Univ New Hampshire, Durham, NH 03824 USA

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

[10] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6012, New Zealand

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 25期

关键词：

VORTICITY; DEPENDENCE;

D O I：

10.1103/PhysRevLett.124.255101

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A familiar problem in space and astrophysical plasmas is to understand how dissipation and heating occurs. These effects are often attributed to the cascade of broadband turbulence which transports energy from large scale reservoirs to small scale kinetic degrees of freedom. When collisions are infrequent, local thermodynamic equilibrium is not established. In this case the final stage of energy conversion becomes more complex than in the fluid case, and both pressure-dilatation and pressure strain interactions (Pi-D -Pi D-ij(ij)) become relevant and potentially important. Pi-D in plasma turbulence has been studied so far primarily using simulations. The present study provides a statistical analysis of Pi-D in the Earth's magnetosheath using the unique measurement capabilities of the Magnetospheric Multiscale (MMS) mission. We find that the statistics of Pi-D in this naturally occurring plasma environment exhibit strong resemblance to previously established fully kinetic simulations results. The conversion of energy is concentrated in space and occurs near intense current sheets, but not within them. This supports recent suggestions that the chain of energy transfer channels involves regional, rather than pointwise, correlations.

引用

页数：7

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