Contributed Talk - Splinter HiRes

Wednesday, 20 September 2017, 14:00   (Auditorium MPS)

Magnetic vortex flow at a supergranular vertex

Iker~S. Requerey1, Basilio~Ruiz~Cobo2,3, Milan~Go\v si\'c4,5
1Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
2Instituto de Astrofísica de Canarias, Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain
3Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
4Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304, USA
5Bay Area Environmental Research Institute, Petaluma, CA 94952, USA

Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that such swirling motions are ubiquitous in the solar surface convection and occur on a large range of temporal and spatial scales. Yet, their interplay with magnetic fields is poorly characterized. In this contributed talk we study the relation between a persistent phothospheric vortex flow and the evolution of a network (NE) magnetic element at a supergranular vertex. We use long-duration sequences of continuum intensity images acquired with Hinode and the local correlation tracking method to derive the horizontal photospheric flows. Supergranular cells are detected as large-scale divergence structures in the flow maps. At their vertices, and co-aligned with NE elements, isolated regions are found where the velocity fields converge on a central point. One of them is observed as a vortex flow during the whole 24 hr time series. It is made of three consecutive vortices that appear nearly at the same location. At their core a NE element is also detected. Its evolution is strongly correlated to that of the vortices. The magnetic feature is concentrated and evacuated whenever is caught by the vortices and weakened and fragmented after the whirls disappear.