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Moat Flow around AR9787


Roth Markus


Kiepenheuer-Institut für Sonnenphysik


Local helioseismology
Auteur(s) supplémentaire(s)Thompson, Michael
Institution(s) supplémentaire(s)University of Sheffield


We present the results of a study of the moat flow around the sunspot AR9787 (the "HELAS sunspot", so-called because it has been the object of in-depth study at a HELAS workshop) using Fourier-Hankel decomposition of the oscillatory wavefield. We carry out inversions both for the sound speed perturbation and for the flow speed as a function of distance from the center of the spot and depth. The results are compared with results from time-distance helioseismology and ring-diagram analysis.
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