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The Helioseismic and Magnetic Imager onboard the Solar Dynamics Observatory(SDO/HMI) provides continuous full-disk observations of solar oscillations. Wedevelop a data-analysis pipeline based on the time-distance helioseismologymethod to measure acoustic travel times using HMI Doppler-shift observations,and infer solar interior properties by inverting these measurements. Thepipeline is used for routine production of near-real-time full-disk maps ofsubsurface wave-speed perturbations and horizontal flow velocities for depthsranging from 0 to 20 Mm, every eight hours. In addition, Carrington synopticmaps for the subsurface properties are made from these full-disk maps. Thepipeline can also be used for selected target areas and time periods. Weexplain details of the pipeline organization and procedures, includingprocessing of the HMI Doppler observations, measurements of the travel times,inversions, and constructions of the full-disk and synoptic maps. Some initialresults from the pipeline, including full-disk flow maps, sunspot subsurfaceflow fields, and the interior rotation and meridional flow speeds, arepresented.

solar physics

Time--Distance Helioseismology Data Analysis Pipeline for Helioseismic  and Magnetic Imager onboard Solar Dynamics Observatory (SDO/HMI) and Its  Initial Results