The Evolution of a Double Diffusive Magnetic Buoyancy Instability

Details The Evolution of a Double Diffusive Magnetic Buoyancy Instability The Evolution of a Double Diffusive Magnetic Buoyancy Instability

2011-08-04

arxiv.org/abs/1108.1116v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

9 pages; 3 figures; accepted to appear in IAU symposium 271

Scientific paper

Recently, Silvers, Vasil, Brummell, & Proctor (2009), using numerical simulations, confirmed the existence of a double diffusive magnetic buoyancy instability of a layer of horizontal magnetic field produced by the interaction of a shear velocity field with a weak vertical field. Here, we demonstrate the longer term nonlinear evolution of such an instability in the simulations. We find that a quasi two-dimensional interchange instability rides (or "surfs") on the growing shear-induced background downstream field gradients. The region of activity expands since three-dimensional perturbations remain unstable in the wake of this upward-moving activity front, and so the three-dimensional nature becomes more noticeable with time.

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