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主題A self-consistent turbulence model for explosive magnetic reconnection
介紹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.
關鍵字
會議地點NAOC A601
演講人Nobumitsu YOKOI
主持人Nobumitsu YOKOI
狀態
語言English
開始時間2013/11/1 14:30
結束時間2013/11/1 15:30
類型lecture
難度少量背景知識
點擊次數2070
父視頻 NAOC COLLOQUIUM
子視頻 無子視頻
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