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Reconnecting flux-rope dynamo

Lookup NU author(s): Dr Andrew Baggaley, Professor Carlo Barenghi, Professor Anvar Shukurov

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Abstract

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.


Publication metadata

Author(s): Baggaley A, Barenghi C, Shukurov A, Subramanian K

Publication type: Article

Publication status: Published

Journal: Physical Review E

Year: 2009

Volume: 80

Issue: 5

ISSN (print): 1539-3755

ISSN (electronic): 1550-2376

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevE.80.055301

DOI: 10.1103/PhysRevE.80.055301


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