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Electromotive force in strongly compressible magnetohydrodynamic turbulence

Part of: 50 years of Mean Field Electrodynamics

Published online by Cambridge University Press:  06 September 2018

Nobumitsu Yokoi Open the ORCID record for Nobumitsu Yokoi [Opens in a new window]
Nobumitsu Yokoi*
Affiliation:
Institute of Industrial Science, University of Tokyo, Komaba, Meguro, Tokyo 153-8505, Japan
*
†Email address for correspondence: [email protected]
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Abstract

Fully compressible magnetohydrodynamic (MHD) turbulence is investigated in the framework of the multiple-scale direct-interaction approximation. With the aid of the propagators (correlation and Green’s functions), fluctuating fields are solved, and turbulent correlations are estimated in highly compressible turbulence. We focus on the expression of the turbulent electromotive force (EMF). Obliqueness between the mean magnetic field and the mean-density gradient, the mean internal density gradient and the non-equilibrium mean velocity contributes to the EMF in the presence of the density variance, which is ubiquitous in turbulence in strongly variable density flows such as the shock-front region. This density-variance effect is expected to locally enhance the turbulence intensity across the shock front, leading to a fast reconnection.

Keywords

astrophysical plasmasplasma nonlinear phenomenaspace plasma physics
Type
Research Article
Information
Journal of Plasma Physics , Volume 84 , Issue 5 , October 2018 , 735840501
Copyright
© Cambridge University Press 2018 

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