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SubjectA self-consistent turbulence model for explosive magnetic reconnection
IntroductionIn 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
PlaceNAOC A601
SpeakerNobumitsu YOKOI
DirectorNobumitsu YOKOI
Status
LanguageEnglish
Start Time2013/11/1 14:30
End Time2013/11/1 15:30
Typelecture
LevelLittle Background
Hits4944
Parent Video NAOC COLLOQUIUM
Sub Video There is no sub video exists.
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