1. Ring Analysis Problems to address (before HMI)

2. Problems to address for Ring Analysis P angle misalignment: washing machine effect P angle misalignment: washing machine effect Foreshortening: the B 0 angle effect Foreshortening: the B 0 angle effect Distortion and camera tip Distortion and camera tip Magnetic activity Magnetic activity Fitting Fitting Different Patch Sizes: particular problems Different Patch Sizes: particular problems Time-delay effect (?) Time-delay effect (?) 3-D Inversions 3-D Inversions

3. P angle Misalignment Courtesy of C. Toner Courtesy of R. Komm

4. Washing machine effect

5. Mt. Wilson Differences Courtesy of C. Rabello-Soares

6. MDI misalignment: meridional flows errors Courtesy of C. Rabello-Soares

7. Foreshortening: B 0 angle effect

8. B 0 angle effect

11. Distortion and camera tip Courtesy of C. Rabello-Soares

12. Magnetic activity

13. Fitting method Courtesy of S. Tripathy SymmetricAsymmetric

14. Small-patch rings Number of Modes Number of Modes Tracking Tracking Fitting Fitting Courtesy of D. Haber

15. Large-patch rings Foreshortening Foreshortening Tracking Tracking Plane-wave approximation Plane-wave approximation

16. Large-patch rings Foreshortening Foreshortening Tracking Tracking Plane-wave approximation Plane-wave approximation

17. Other issues Time Delay Time Delay 3-D Inversions 3-D Inversions