Speaker
Description
We study transverse (kink mode) oscillations in threads of solar prominences, which are large dense, cool plasma structures suspended in the Sun’s corona by magnetic fields. These threads can show both collective and individual behaviour, when threads or groups of threads oscillate with their own periods independently from the rest of the prominence.
Several studies have suggested that these and some other oscillatory phenomena in the solar atmosphere may be explained by the phenomenon of vortex shedding, a process well known in classical fluid dynamics in which alternating vortices are shed from a body immersed in a flowing fluid. This phenomenon has been widely studied in hydrodynamics but has not yet been satisfactorily investigated in magnetohydrodynamic conditions, such as in the solar atmosphere.
We study prominence oscillations in association with vortex shedding numerically by the magnetohydrodynamic approach in three dimensions. We model the structures as groups of flexible cylindrical bodies. Specifically, we ran a simulation with a group of three vertically aligned cylindrical bodies, and three simulations with two horizontally aligned cylindrical bodies at varying distances to evaluate the influence of separation distance.
