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Subject
A self-consistent turbulence model for explosive magnetic reconnection
Introduction
In order to obtain a fast magnetic reconnection we need some mechanisms that enhance the effective magnetic diffusivity. Turbulence is considered to be one of such candidates. Focusing on the turbulence effects in the mean magnetic - field evolution, we construct a system of turbulence model, where the tu rbulent evolution is solved through the transport equations of several turbulent statistical quantities, in addition to the mean - field equations for the density, momentum, and energy. Numerical results showed that a slow laminar - like reconnection for very weak turbulence, and just a turbulent diffusion of the mean magnetic field (no fast reconnection) for too much turbulence. Another interesting point is the role of the cross helicity (velocity -- magnetic - field correlation). The dynamic balance between the t ransport enhancement and suppression due to turbulence, the turbulent cross helicity contributes to localization of the effective magnetic diffusivity, leading to a fast reconnection.
Keywords
Place
NAOC A601
Speaker
Nobumitsu YOKOI
Director
Nobumitsu YOKOI
Status
Language
English
Start Time
2013/11/1 14:30
End Time
2013/11/1 15:30
Type
lecture
Level
Little Background
Hits
5933
Parent Video
NAOC COLLOQUIUM
Sub Video
There is no sub video exists.
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A self-consistent turbulence model for explosive magnetic reconnection
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