Dynamo action and magnetic buoyancy in convection simulations with radial shear
by
DrGustavo Guerrero(NORDITA)
→
Europe/Stockholm
122:026
122:026
Description
One of the existing hypothesis on sunspot formation is the buoyant emergence of magnetic flux
tubes created by the strong radial shear at the tachocline. In this scenario, the magnetic
field has to exceed a threshold value before it becomes buoyant and emerges through the
convection zone up to the surface. However, several physical constrains are required to be
fulfilled for this model to be feasible. In this seminar I will present the results of
numerical simulations of thermal convection including a narrow radial shear layer. This
model mimics, within the numerical limitations, the conditions in the solar convection
zone and the tachocline. The excitation of dynamo action as well as the buoyant properties of
the generated magnetic field are explored under different conditions.
