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  • PLASMA PHYSICS  (2)
  • 1
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    Fast-dynamo action in unsteady flows and maps in three dimensions (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Unsteady fast-dynamo action is obtained in a family of stretch-fold-shear maps applied to a spatially periodic magnetic field in three dimensions. Exponential growth of a mean field in the limit of vanishing diffusivity is demonstrated by a numerical method which alternates instantaneous deformations with molecular diffusion over a finite time interval. Analysis indicates that the dynamo is a coherent feature of the large scales, essentially independent of the cascade of structure to small scales.
    Keywords: PLASMA PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 59; 1573-157
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Evidence for fast dynamo action in a chaotic web (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The evolution of a magnetic field in a chaotic web is studied. The model flow possessing the web is closely related to the nearly integrable ABC flow with A = B and C much less than 1. The magnetic diffusivity is taken to be zero and the field is followed using the Cauchy solution. It is found that the flow folds the magnetic field constructively, in the sense that the average magnetic field in a chaotic region grows exponentially in time. This is suggestive of fast dynamo action, although the effect of diffusion of the strong streamwise magnetic field remains to be assessed.
    Keywords: PLASMA PHYSICS
    Type: Physical Review Letters (ISSN 0031-9007); 65; 2133-213
    Format: text
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    NASA TECHNICAL REPORTS
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