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We study the possibility of consistent extension of MDI full-dischelioseismic campaigns with the growing data set of HMI observations. To do so,we down-sample and filter the HMI Dopplegrams so that the resulting spatialpower spectrum is similar to the spatial power spectrum of MDI full-discDopplergrams. The set of co-spatial and co-temporal datacube pairs from bothinstruments containing no missing and no bad frames were processed using thesame codes and inverted independently for all three components of the plasmaflow in the near surface layers. The results from the two instruments arehighly correlated, however systematically larger (by ~20%) flow magnitudes arederived from HMI. We comment that this may be an effect of the differentformation depth of the Doppler signal

Time--distance inversions for horizontal and vertical flows on supergranular scales applied to MDI and HMI data