postscript
Inversions using mode frequency splittings reveal interior rotation. A detailed study using 8 inversion codes and testing with artificial data has resulted in greater confidence in deductions. The deep interior and regions near the rotation axis are the most uncertain. The results are shown as contour plots of omega and as a colored image of omega.
The inferred internal rotation can also be viewed as colors representing rotation rate. Redder is faster, bluer is slower. The high latitude "jet stream" detected in the "2dRLS" inversion method is visible in this image. This image and several others were prepared for a NASA Space Science Update in August 1997.
Analysis of the f-mode frequencies has allowed unambiguous detection of the zonal flow pattern reported a cycle ago from Mt. Wilson observations. These faster and slower "streams" migrate to the equator during the cycle. The drift has been verified with 5 72-day segments of MDI medium-l p-mode data. The plot below is the original result with the f-mode analysis. A preprint is available.
