Poster abstract details

Inversions of frequencies of solar high-degree modes obtained from ring-diagram analyses have been used successfully to study the near-surface structure of solar active regions. This technique, although useful, has so far been restricted to the study of specific regions, not applied to large quantities of data covering the full Sun. As part of the preparation for the large quantities of high resolution helioseismic data expected from the upcoming HMI instrument on the SDO spacecraft, we are perform structure inversions with frequencies obtained from the so-called ``densepacks'' of ring spectra for tracked regions of data the MDI instrument on board the SOHO. Each ``densepack'' is a set of 195 regions covering most of the solar disc and ranging between latitudes of $\pm 60^\circ$ and Stonyhurst longitudes of $\pm 52.5^\circ$. New sets are produced 24 times per Carrington rotation. Structure inversions of these data will allow us to make synoptic maps of the structure of the near-surface regions across the solar disc.