Speaker
Dr
Gustavo Guerrero
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.
