Persistent magnetic vortex flow at a supergranular vertex

DOI: 
10.1051/0004-6361/201731842
Publication date: 
21/03/2018
Main author: 
Requerey I.S.
IAA authors: 
Rubio, L.R.B.
Authors: 
Requerey I.S., Cobo B.R., Gošić M., Rubio L.R.B.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
610
Pages: 
A84
Number: 
A84
Abstract: 
Context. Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that these swirling motions are ubiquitous in the solar surface convection and occur in a wide range of temporal and spatial scales. Their interplay with magnetic fields is poorly characterized, however. Aims. We study the relation between a persistent photospheric vortex flow and the evolution of a network magnetic element at a supergranular vertex. Methods. We used 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 cospatial with network magnetic elements, the velocity flows converge on a central point. Results. One of these converging flows is observed as a vortex during the whole 24 h time series. It consists of three consecutive vortices that appear nearly at the same location. At their core, a network magnetic element is also detected. Its evolution is strongly correlated to that of the vortices. The magnetic feature is concentrated and evacuated when it is caught by the vortices and is weakened and fragmented after the whirls disappear. Conclusions. This evolutionary behavior supports the picture presented previously, where a small flux tube becomes stable when it is surrounded by a vortex flow. © ESO 2018.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2018A&A...610A..84R/abstract
ADS Bibcode: 
2018A&A...610A..84R
Keywords: 
Methods: observational; Sun: granulation; Sun: magnetic fields; Sun: photosphere