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Title: Drift turbulence, particle transport, and anomalous dissipation at the reconnecting magnetopause

Journal Article · · Physics of Plasmas
DOI:https://doi.org/10.1063/1.5027086· OSTI ID:1477696

Here, using fully kinetic 3D simulations, the reconnection dynamics of asymmetric current sheets are examined at the Earth's magnetopause. The plasma parameters are selected to model MMS magnetopause diffusion region crossings with guide fields of 0.1, 0.4, and 1 of the reconnecting magnetosheath field. In each case, strong drift-wave fluctuations are observed in the lower-hybrid frequency range at the steep density gradient across the magnetospheric separatrix. These fluctuations give rise to cross-field electron particle transport. In addition, this turbulent mixing leads to significantly enhanced electron parallel heating in comparison to 2D simulations. We study three different methods of quantifying the anomalous dissipation produced by the drift fluctuations, based on spatial averaging, temporal averaging, and temporal averaging followed by integrating along magnetic field lines. A comparison of different methods reveals complications in identifying and measuring the anomalous dissipation. Nevertheless, the anomalous dissipation from short wavelength drift fluctuations appears weak for each case, and the reconnection rates observed in 3D are nearly the same as in 2D models. Finally, the 3D simulations feature a number of interesting new features that are consistent with recent MMS observations, including cold beams of magnetosheath electrons that penetrate into the hotter magnetospheric inflow, the related observation of decreasing temperature in regions of increasing total density, and an effective turbulent diffusion coefficient that agrees with predictions from quasi-linear theory.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Dartmouth College, Hanover, NH (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES); LANL Laboratory Directed Research and Development (LDRD) Program; National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC52-06NA25396; NNX14AL38G; NNH17AE36I; NNH13AW51I; NNX16AG75G
OSTI ID:
1477696
Alternate ID(s):
OSTI ID: 1439392
Report Number(s):
LA-UR-18-21459
Journal Information:
Physics of Plasmas, Vol. 25, Issue 6; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (7)

Structure of Electron‐Scale Plasma Mixing Along the Dayside Reconnection Separatrix journal November 2019
The two-fluid dynamics and energetics of the asymmetric magnetic reconnection in laboratory and space plasmas journal December 2018
Influence of 3D plasmoid dynamics on the transition from collisional to kinetic reconnection journal July 2019
Three-dimensional stability of current sheets supported by electron pressure anisotropy journal October 2019
Large-scale Compression Acceleration during Magnetic Reconnection in a Low- β Plasma journal October 2018
Formation of Power-law Electron Energy Spectra in Three-dimensional Low- β Magnetic Reconnection journal October 2019
Universality of lower hybrid waves at Earth's magnetopause text January 2019

Figures / Tables (23)