Turbulent Dynamos and Magnetic Helicity

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It is shown that the turbulent dynamo alpha-effect converts magnetic helicity from the turbulent field to the mean field when the turbulence is electromagnetic while the magnetic helicity of the mean-field is transported across space when the turbulence is elcetrostatic or due to the elcetron diamagnetic effect. In all cases, however, the dynamo effect strictly conserves the total helicity expect for a battery effect which vanishes in the limit of magnetohydrodynamics. Implications for astrophysical situations, especially for the solar dynamo, are discussed.

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182 Kilobytes

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Ji, Hantao April 1, 1999.

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Description

It is shown that the turbulent dynamo alpha-effect converts magnetic helicity from the turbulent field to the mean field when the turbulence is electromagnetic while the magnetic helicity of the mean-field is transported across space when the turbulence is elcetrostatic or due to the elcetron diamagnetic effect. In all cases, however, the dynamo effect strictly conserves the total helicity expect for a battery effect which vanishes in the limit of magnetohydrodynamics. Implications for astrophysical situations, especially for the solar dynamo, are discussed.

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182 Kilobytes

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  • Other: DE00006680
  • Report No.: PPPL-3344
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/6680 | External Link
  • Office of Scientific & Technical Information Report Number: 6680
  • Archival Resource Key: ark:/67531/metadc709760

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 1, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 15, 2016, 7:58 p.m.

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Ji, Hantao. Turbulent Dynamos and Magnetic Helicity, report, April 1, 1999; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc709760/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.