On turbulent reconnection

Eun Jin Kim, P. H. Diamond

Research output: Contribution to journalArticle

34 Citations (Scopus)
2 Downloads (Pure)

Abstract

We examine the dynamics of turbulent reconnection in two-dimensional and three-dimensional reduced MHD by calculating the effective dissipation due to coupling between small-scale fluctuations and large-scale magnetic fields. Sweet-Parker type balance relations are then used to calculate the global reconnection rate. Two approaches are employed - quasi-linear closure and an eddy-damped fluid model. Results indicate that despite the presence of turbulence, the reconnection rate remains inversely proportional to √Rem, as in the Sweet-Parker analysis. In two-dimensions, the global reconnection rate is shown to be enhanced over the Sweet-Parker result by a factor of magnetic Mach number. These results are the consequences of the constraint imposed on the global reconnection rate by the requirement of mean-square magnetic potential balance. The incompatibility of turbulent fluid-magnetic energy equipartition and stationarity of mean-square magnetic potential is demonstrated.

Original languageEnglish
Pages (from-to)1052-1065
Number of pages14
JournalAstrophysical Journal
Volume556
Issue number2
DOIs
Publication statusPublished - 1 Aug 2001
Externally publishedYes

Bibliographical note

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Keywords

  • Magnetic fields
  • MHD
  • Turbulence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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