Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)

Attie, R., Innes, D. E. and Potts, H.E. (2009) Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode). Astronomy and Astrophysics, 493(2), L13-L16. (doi: 10.1051/0004-6361:200811258)

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Publisher's URL: http://dx.doi.org/10.1051/0004-6361:200811258


Context. Twisting motions of different sorts are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large-scale twisted topology of many solar features. Nevertheless, their occurrence on a large scale in the quiet photosphere has not been investigated yet. Aims. The present study reveals the existence of vortex flows located at the supergranular junctions of the quiet Sun. Methods. We used a 1-h and a 5-h time series of the granulation in blue continuum and G-band images from FG/SOT to derive the photospheric flows. A feature-tracking technique called balltracking was performed to track the granules and reveal the underlying flow fields. Results. In both time series, we identify long lasting vortex flow located at supergranular junctions. The first vortex flow lasts at least 1 h and is ~20´´ wide (~15.5 Mm). The second vortex flow lasts more than 2 h and is ~27´´ wide (~21 Mm).

Item Type:Articles
Glasgow Author(s) Enlighten ID:Potts, H.E.
Authors: Attie, R., Innes, D. E., and Potts, H.E.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Astronomy and Astrophysics
Publisher:EDP Sciences
ISSN (Online):1432-0746
Published Online:27 November 2008

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
465931Solar, stellar and cosmological plasmas: a synthesis of data, modelling and theory.Declan DiverScience & Technologies Facilities Council (STFC)ST/F002149/1Physics and Astronomy