Magnetic buoyancy instabilities in the solar tachocline

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• Paul Bushby (Newcastle University)
• Monday 04 June 2018, 14:00-15:00
• MR14, Centre for Mathematical Sciences, Wilberforce Road, Cambridge.

If you have a question about this talk, please contact Dr. Yufeng Lin.

Sunspots are surface manifestations of a large-scale magnetic field that rises to the solar photosphere, under the action of magnetic buoyancy, from deep within the solar interior. It is generally accepted that most of the large-scale magnetic flux that appears at the surface originates from the tachocline, which is a region of strong differential rotation around the base of the solar convection zone. Adopting an idealised model that mimics a local region of the tachocline, I will discuss magnetic buoyancy instabilities in a shear-generated magnetic layer. Recent results suggest that such an instability can only operate in rather restricted regions of parameter space, which would have serious implications for the solar tachocline; I will focus particularly upon the extent to which these results actually constrain the magnetic buoyancy instability in this system. Finally, I will describe some preliminary calculations that suggest that shear-driven magnetic buoyancy may be playing a crucial role in the large-scale solar dynamo (for which there is still no universally accepted model

This talk is part of the DAMTP Astrophysics Seminars series.

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