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Lookup NU author(s): Dr Andrew Baggaley,
Professor Carlo Barenghi,
Professor Anvar Shukurov
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We develop a model of the fluctuation dynamo in which the magnetic field is confined to thin flux ropes advected by a multiscale model of turbulence. Magnetic dissipation occurs only via reconnection of the flux ropes. This model can be viewed as an implementation of the asymptotic limit Rm → for a continuous magnetic field, where magnetic dissipation is strongly localized to small regions of strong-field gradients. We investigate the kinetic-energy release into heat mediated by the dynamo action, both in our model and by solving the induction equation with the same flow. We find that a flux-rope dynamo is an order of magnitude more efficient at converting mechanical energy into heat. The probability density of the magnetic energy release in reconnections has a power-law form with the slope -3, consistent with the solar corona heating by nanoflares. © 2009 The American Physical Society.
Author(s): Baggaley A, Barenghi C, Shukurov A, Subramanian K
Publication type: Article
Publication status: Published
Journal: Physical Review E
ISSN (print): 1539-3755
ISSN (electronic): 1550-2376
Publisher: American Physical Society
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