Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-11
Astronomy and Astrophysics
Astrophysics
11 pages, 10 figures, 3 tables (see http://www.iac.es/galeria/svargas/vargas2008.pdf for better quality figures
Scientific paper
10.1086/587139
High-resolution time series of sunspots have been obtained with the Swedish 1m Solar Telescope between 2003 and 2006 at different locations on the solar disc. Proper motions in seven different active regions have been studied. The analysis has been done by applying local correlation tracking to every series of sunspots, each of them more than 40 minutes long. The sunspots' shapes include a different variety of penumbral configurations. We report on a systematic behaviour of the large-scale outflows surrounding the sunspots, commonly known as moat flows, that are essentially present only when preceded by a penumbra not tangential but perpendicular to the sunspot border. We present one case for which this rule appears not to be confirmed. We speculate that the magnetic neutral line, which is located in the vicinity of the anomalous region, might be responsible for blocking the outflow. These new results confirm the systematic and strong relation between the moat flows and the existence of penumbrae. A comparative statistical study between moats and standard granulation is also performed.
Bonet Jose Antonio
der Voort Luc Rouppe van
Dominguez Santiago Vargas
Katsukawa Yukio
Martinez Pillet Valentin
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