Left: positions (green crosses) of centers of supergranules identified near disk center on 2 May 2010. Supergranules that are outside of the green frame have been discarded. The grayscale image shows the f-mode travel-time differences (white is for outflows, black for inflows) using 8 h of SDO/HMI observations. The colorbar is truncated in the range between −80 and 80 s. The filled contours denote areas where the HMI line-of-sight magnetic field averaged over 8 h exceeds 20 Gauss in absolute value (red is positive field strength, blue is negative). Right: travel-time map for the average supergranule, where negative (positive) values correspond to horizontal outflows (inflows). The black circles have radii of 11 and 18 Mm.
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