Magnetic field generation by coherent turbulence structures

D Kivotides, A J Mee, C F Barenghi

Research output: Contribution to journalArticle

5 Citations (Scopus)
10 Downloads (Pure)

Abstract

It is thought that the small-scale magnetic fields observed in accretion discs, galaxies and galactic clusters are generated by a dynamo process in which the turbulent plasma amplifies small initial magnetic fluctuations. Numerical simulations of turbulence have revealed that turbulence consists of filamentlike vortex structures superimposed on an incoherent background, which carry a considerable amount of the energy. The natural questions to ask are whether these coherent structures can generate a magnetic field and, if so, if the generated magnetic field is also filament-like. After setting up a turbulence model which consists only of vortex filaments, we show in an unambiguous way that the coherent structure can sustain kinematic dynamo action and that the magnetic field thus generated consists of relatively thick ribbons (flattened tubes) located in between vortices.
Original languageEnglish
Article number291
Number of pages9
JournalNew Journal of Physics
Volume9
DOIs
Publication statusPublished - 31 Aug 2007

Fingerprint

turbulence
magnetic fields
vortices
vortex filaments
galactic clusters
turbulence models
accretion disks
ribbons
filaments
kinematics
tubes
galaxies
simulation
energy

Keywords

  • computer simulation
  • DC generators
  • numerical methods
  • vortex flow
  • galactic clusters
  • natural questions
  • thick ribbons
  • magnetohydrodynamics

Cite this

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Magnetic field generation by coherent turbulence structures. / Kivotides, D; Mee, A J; Barenghi, C F.

In: New Journal of Physics, Vol. 9, 291, 31.08.2007.

Research output: Contribution to journalArticle

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AU - Kivotides, D

AU - Mee, A J

AU - Barenghi, C F

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AB - It is thought that the small-scale magnetic fields observed in accretion discs, galaxies and galactic clusters are generated by a dynamo process in which the turbulent plasma amplifies small initial magnetic fluctuations. Numerical simulations of turbulence have revealed that turbulence consists of filamentlike vortex structures superimposed on an incoherent background, which carry a considerable amount of the energy. The natural questions to ask are whether these coherent structures can generate a magnetic field and, if so, if the generated magnetic field is also filament-like. After setting up a turbulence model which consists only of vortex filaments, we show in an unambiguous way that the coherent structure can sustain kinematic dynamo action and that the magnetic field thus generated consists of relatively thick ribbons (flattened tubes) located in between vortices.

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