In Situ Observation of Intermittent Dissipation at Kinetic Scales in the Earth's Magnetosheath

Alexandros Chasapis; W. H. Matthaeus; T. N. Parashar; M Wan; C. C. Haggerty; C. J. Pollock; B. L. Giles; W. R. Paterson; J. Dorelli; D. J. Gershman; R. B. Torbert; C. T. Russell; P. A. Lindqvist; Y. Khotyaintsev; T. E. Moore; R. E. Ergun; J. L. Burch

doi:10.3847/2041-8213/aaadf8

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In Situ Observation of Intermittent Dissipation at Kinetic Scales in the Earth's Magnetosheath

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In Situ Observation of Intermittent Dissipation at Kinetic Scales in the Earth's Magnetosheath

Alexandros Chasapis, W. H. Matthaeus, T. N. Parashar, M Wan, C. C. Haggerty, C. J. Pollock, B. L. Giles, W. R. Paterson, J. Dorelli, D. J. Gershman, …

Astrophysical journal. Letters, Vol.856(1), p.L19

03/20/2018

DOI: 10.3847/2041-8213/aaadf8

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Abstract

We present a study of signatures of energy dissipation at kinetic scales in plasma turbulence based on observations by the Magnetospheric Multiscale mission (MMS) in the Earth’s magnetosheath. Using several intervals, and taking advantage of the high-resolution instrumentation on board MMS, we compute and discuss several statistical measures of coherent structures and heating associated with electrons, at previously unattainable scales in space and time. We use the multi-spacecraft Partial Variance of Increments (PVI) technique to study the intermittent structure of the magnetic field. Furthermore, we examine a measure of dissipation and its behavior with respect to the PVI as well as the current density. Additionally, we analyze the evolution of the anisotropic electron temperature and non-Maxwellian features of the particle distribution function. From these diagnostics emerges strong statistical evidence that electrons are preferentially heated in subproton-scale regions of strong electric current density, and this heating is preferentially in the parallel direction relative to the local magnetic field. Accordingly, the conversion of magnetic energy into electron kinetic energy occurs more strongly in regions of stronger current density, a finding consistent with several kinetic plasma simulation studies and hinted at by prior studies using lower resolution Cluster observations.

Turbulence

acceleration of particles

magnetic reconnection

plasmas

waves

Details

Title: Subtitle: In Situ Observation of Intermittent Dissipation at Kinetic Scales in the Earth's Magnetosheath
Creators: Alexandros Chasapis - University of Delaware
W. H. Matthaeus - University of Delaware
T. N. Parashar - University of Delaware
M Wan - Southern University of Science and Technology
C. C. Haggerty - University of Delaware
C. J. Pollock - Goddard Space Flight Center
B. L. Giles - Goddard Space Flight Center
W. R. Paterson - Goddard Space Flight Center
J. Dorelli - Goddard Space Flight Center
D. J. Gershman - Goddard Space Flight Center
R. B. Torbert - University of New Hampshire
C. T. Russell - University of California, Los Angeles
P. A. Lindqvist - KTH Royal Institute of Technology
Y. Khotyaintsev - Swedish Institute of Space Physics
T. E. Moore - Goddard Space Flight Center
R. E. Ergun - Laboratory for Atmospheric and Space Physics
J. L. Burch - Southwest Research Institute
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.856(1), p.L19
DOI: 10.3847/2041-8213/aaadf8
ISSN: 2041-8205
eISSN: 2041-8213
Grant note: NNX14AC39G; NNX17AB79G / National Aeronautics and Space Administration (http://data.elsevier.com/vocabulary/SciValFunders/100000104) 11672123; 91752201 / National Natural Science Foundation of China (http://data.elsevier.com/vocabulary/SciValFunders/501100001809) AGS-1460130 / NSF-SHINE
Language: English
Date published: 03/20/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9985224413802771

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