34th Solar Physics Division Meeting, June 2003
Session 8 Helioseismology
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[8.06] Comparison of Solar Subsurface Weather Obtained with Time-Distance Tomography and Ring Analysis

B.W. Hindman (JILA, University of Colorado), J. Zhao (HEPL, Stanford University), D.A. Haber (JILA, University of Colorado), A.G. Kosovichev (HEPL, Stanford University), J. Toomre (JILA, University of Colorado)

The near-surface shear layer exhibits a rich medley of flows that vary in size from granular and supergranular flows to flows of global scale. The largest of these flows have been dubbed Solar Surface Weather (SSW), and have been detected with both time-distance tomography and ring analysis. We present comparisons of synoptic maps of SSW flows obtained with both techniques from SOI-MDI Dynamics Program data. Both techniques provide measurements of the flows as a function of depth through inversion. The time-distance method utilizes only p-mode oscillations, while the ring analysis uses f modes as well. We find that the flows obtained with the two helioseismic techniques are remarkably similar, with common inflow and outflow sites as well as agreement in the general flow direction. At a depth of roughly 1.5 Mm the Spearman rank correlation coefficient between maps is on the order of 0.80. As the depth increases the correlation become weaker. The reduction in the correlation coefficient with depth is due to the increasing difference between the vertical resolution kernel of the two seismic techniques.


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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.