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A 100 KW Class Applied-field Magnetoplasmadynamic Thruster
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Published on: December 22, 2018

Explosive turbulent magnetic reconnection.

K Higashimori1, N Yokoi, M Hoshino

  • 1Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan.

Physical Review Letters
|July 9, 2013
PubMed
Summary
This summary is machine-generated.

Turbulent magnetic reconnection simulations reveal three development pathways for current sheets based on turbulence strength. Fast turbulent reconnection explosively converts magnetic energy, generating plasma jets via localized turbulent diffusion.

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Area of Science:

  • Plasma Physics
  • Astrophysical Fluid Dynamics
  • Computational Magnetohydrodynamics

Background:

  • Magnetic reconnection is a fundamental process in plasma physics, crucial for energy release in astrophysical phenomena.
  • Understanding the transition from laminar to turbulent reconnection is key to explaining explosive events.

Purpose of the Study:

  • To investigate the development of turbulent magnetic reconnection using a novel Reynolds-averaged magnetohydrodynamics (MHD) model.
  • To characterize the different pathways of current sheet evolution under varying turbulence levels.

Main Methods:

  • Development and application of a new Reynolds-averaged MHD model for turbulent simulations.
  • Simulation of a Harris current sheet under different turbulence conditions.

Main Results:

  • Identified three distinct development pathways: laminar reconnection, turbulent reconnection, and turbulent diffusion.
  • Turbulent reconnection was found to explosively convert magnetic energy into kinetic and thermal plasma energy.
  • Observed the generation of fast reconnection jets and the crucial role of localized turbulent diffusion in enabling this process.
  • Demonstrated that the interaction between the mean field and turbulence leads to the formation of localized structures.

Conclusions:

  • The study highlights the critical role of turbulence in magnetic reconnection dynamics.
  • Localized turbulent diffusion is identified as the mechanism driving fast reconnection and jet formation.
  • The findings provide new insights into the complex interplay between mean fields and turbulence in magnetized plasmas.