Fluctuation dynamo amplified by intermittent shear bursts in convectively driven magnetohydrodynamic turbulence

Pratt, J., Busse, A. and Müller, W.-C. (2013) Fluctuation dynamo amplified by intermittent shear bursts in convectively driven magnetohydrodynamic turbulence. Astronomy and Astrophysics, 557, A76. (doi: 10.1051/0004-6361/201321613)

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Publisher's URL: http://dx.doi.org/10.1051/0004-6361/201321613

Abstract

Intermittent large-scale high-shear flows are found to occur frequently and spontaneously in direct numerical simulations of statistically stationary turbulent Boussinesq magnetohydrodynamic (MHD) convection. The energetic steady state of the system is sustained by convective driving of the velocity field and small-scale dynamo action. The intermittent emergence of flow structures with strong velocity and magnetic shearing generates magnetic energy at an elevated rate on time scales that are longer than the characteristic time of the large-scale convective motion. The resilience of magnetic energy amplification suggests that intermittent shear bursts are a significant driver of dynamo action in turbulent magnetoconvection.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Busse, Dr Angela
Authors: Pratt, J., Busse, A., and Müller, W.-C.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:UNSPECIFIED
Journal Name:Astronomy and Astrophysics
Publisher:EDP Sciences
ISSN:0004-6361
ISSN (Online):1432-0746
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