Baggaley, Andrew W. ; Barenghi, Carlo F. ; Shukurov, Anvar (2009) Reconnecting flux-rope dynamo Physical Review E - Statistical, Nonlinear and Soft Matter Physics, 80 (5). 055301. ISSN 1539-3755
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Official URL: http://pre.aps.org/abstract/PRE/v80/i5/e055301
Related URL: http://dx.doi.org/10.1103/PhysRevE.80.055301
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.
Item Type: | Article |
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Source: | Copyright of this article belongs to The American Physical Society. |
ID Code: | 68042 |
Deposited On: | 02 Nov 2011 03:16 |
Last Modified: | 02 Nov 2011 03:16 |
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