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dc.contributor.authorAsgari-Targhi, M.
dc.contributor.authorBerger, M.A.
dc.date.accessioned2013-04-15T14:54:06Z
dc.date.issued2009
dc.description.abstractThis article looks at the influence of writhe in the stretch-twist-fold dynamo. We consider a thin flux tube distorted by simple stretch, twist, and fold motions and calculate the helicity and energy spectra. The writhe number assists in the calculations, as it tells us how much the internal twist changes as the tube is distorted. In addition it provides a valuable diagnostic for the degree of distortion. Non mirror-symmetric dynamos typically generate magnetic helicity of one sign on large-scales and the opposite sign on small scales. The calculations presented here confirm the hypothesis that the large-scale helicity corresponds to writhe and the small scale corresponds to twist. In addition, the writhe helicity spectrum exhibits an interesting oscillatory behavior. The technique of calculating Fourier spectra for the writhe helicity may be useful in other areas of research, for example, the study of highly coiled molecules.en_GB
dc.identifier.citationVol. 103 (1), pp. 69 - 87en_GB
dc.identifier.doi10.1080/03091920802531791
dc.identifier.urihttp://hdl.handle.net/10871/8284
dc.language.isoenen_GB
dc.publisherTaylor & Francisen_GB
dc.relation.urlhttp://dx.doi.org/10.1080/03091920802531791en_GB
dc.relation.urlhttp://www.tandfonline.com/10.1080/03091920802531791en_GB
dc.subjectDynamoen_GB
dc.subjectWritheen_GB
dc.subjectHelicityen_GB
dc.subjectStretch-twist-folden_GB
dc.subjectSolaren_GB
dc.titleWrithe in the Stretch-Twist-Fold Dynamoen_GB
dc.typeArticleen_GB
dc.date.available2013-04-15T14:54:06Z
dc.identifier.issn0309-1929
dc.descriptionThis is an Author's Original Manuscript of an article whose final and definitive form, the Version of Record, has been published in Geophysical and Astrophysical Fluid Dynamics (2008) Copyright © 2008 Taylor & Francis, available online at: http://www.tandfonline.com/10.1080/03091920802531791en_GB
dc.identifier.eissn1029-0419
dc.identifier.journalGeophysical and Astrophysical Fluid Dynamicsen_GB


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