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

Details Comparison of Solar Subsurface Weather Obtained with Time-Distance Tomography and Ring Analysis Comparison of Solar Subsurface Weather Obtained with Time-Distance Tomography and Ring Analysis

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spd....34.0806h&link_type=abstract

American Astronomical Society, SPD meeting #34, #08.06; Bulletin of the American Astronomical Society, Vol. 35, p.822

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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