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

Bandyopadhyay，Riddhi1; Matthaeus，William H.1,2; Parashar，Tulasi N.1; Yang，Yan3; Chasapis，Alexandros4; 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

2020-06-26

10.1103/PhysRevLett.124.255101

PHYSICAL REVIEW LETTERS   影响因子和分区

0031-9007

1079-7114

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-ΠijDij) 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.

SCI ; EI

英语

其他

20202908949367

Energy conversion ; Kinetics ; Magnetosphere ; Plasma turbulence ; Energy transfer ; Magnetohydrodynamics

Atmospheric Properties:443.1 ; Energy Conversion Issues:525.5 ; Magnetohydrodynamics (MHD) Power Generation:615.3 ; Fluid Flow, General:631.1 ; Magnetism: Basic Concepts and Phenomena:701.2 ; Classical Physics; Quantum Theory; Relativity:931 ; Mechanics:931.1 ; Plasma Physics:932.3

PHYSICS

2-s2.0-85087703960

Scopus

1.Department of Physics and Astronomy,University of Delaware,Newark,19716,United States
2.Bartol Research Institute,University of Delaware,Newark,19716,United States
3.Southern University of Science and Technology,Shenzhen, Guangdong,518055,China
4.Laboratory for Atmospheric and Space Physics,University of Colorado Boulder,Boulder,80303,United States
5.NASA Goddard Space Flight Center,Greenbelt,20771,United States
6.Denali Scientific,Fairbanks,99709,United States
7.University of California,Los Angeles,90095-1567,United States
8.University of New Hampshire,Durham,03824,United States
9.Southwest Research Institute,San Antonio,78238-5166,United States

Bandyopadhyay，Riddhi,Matthaeus，William H.,Parashar，Tulasi N.,et al. Statistics of Kinetic Dissipation in the Earth's Magnetosheath: MMS Observations[J]. PHYSICAL REVIEW LETTERS,2020,124(25).

Bandyopadhyay，Riddhi.,Matthaeus，William H..,Parashar，Tulasi N..,Yang，Yan.,Chasapis，Alexandros.,...&Burch，James L..(2020).Statistics of Kinetic Dissipation in the Earth's Magnetosheath: MMS Observations.PHYSICAL REVIEW LETTERS,124(25).

Bandyopadhyay，Riddhi,et al."Statistics of Kinetic Dissipation in the Earth's Magnetosheath: MMS Observations".PHYSICAL REVIEW LETTERS 124.25(2020).