Inferring Subphotospheric Supergranular Flows by Time-Distance Helioseismology

Details Inferring Subphotospheric Supergranular Flows by Time-Distance Helioseismology Inferring Subphotospheric Supergranular Flows by Time-Distance Helioseismology

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh52a0460z&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SH52A-0460

Physics

7522 Helioseismology

Scientific paper

Time-distance helioseismology has provided us a tool to investigate the interior structures and flow fields of the Sun. Combining the measurements from surface- and deep-focusing schemes, we have attempted to derive the flow maps of supergranules by using the LSQR algorithm. The divergent horizontal flow fields are obtained near the surface, and there is evidence of converging flows below 12 megameters or so. The main difficulty is in inferring the vertical component of the flow field because of strong cross-talk between the horizontal divergence and the vertical velocity in the travel-time data. A Multi-Channel Deconvolution technique was also employed to derive the velocity fields, and the results agree well with those from LSQR inversion. We discuss the systematic and random errors of the measurements, and implications of the initial results for understanding the supergranular convection.

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