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Time Distance Products

Time-distance helioseismology pipeline generates subsurface maps of horizontal flow velocities and wave-speed perturbation for the full-disk Sun, and also for selected active regions. The maps are obtained for 8-hour intervals, and cover horizontal areas of 30° x 30° and 0 -- 20 Mm in depth.

Data Analysis Procedure:

The basic procedure for the time-dis tance data-analysis pipeline is the following:

Thus, our products include two sets of acoustic travel times and four sets of inversion results in both the flow-velocity and wave-speed perturbation fields.

Available Data products


Detailed procedure and description of results can be found in the paper :
Time-Distance Helioseismology Data-Analysis Pipeline for Helioseismic and Magnetic Imager Onboard Solar Dynamics Observatory (SDO/HMI) and Its Initial Results

For details of the travel-time fittings and comparion of different fitting methods, please refer to the paper:
Implementation and Comparison of Acoustic Travel-Time Measurement Procedures for the Solar Dynamics Observatory/Helioseismic and Magnetic Imager Time-Distance Helioseismology Pipeline

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