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主题A self-consistent turbulence model for explosive magnetic reconnection
介绍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.
关键字
会议地点NAOC A601
演讲人Nobumitsu YOKOI
主持人Nobumitsu YOKOI
状态
语言English
开始时间2013/11/1 14:30
结束时间2013/11/1 15:30
类型lecture
难度少量背景知识
点击次数4755
父视频 NAOC COLLOQUIUM
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