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Analysis and Progress of MWO Tower Studies - Ridge Fitting and Data Comparison

This report outlines the status of MWO 60-Foot Tower analyses and progress in ridge fitting, including data transfer updates and flow map comparisons. Recent advancements in zonal flow studies and fitting unaveraged power spectra are highlighted. Comparison of MDI and MWO flow maps from 1996 and 2001 reveals slow field rotation observations and geometric differences needing further investigation. The correction of apparent short-term position angle changes using corrected maps is discussed. The report also details recent progress in ridge fitting, with improved fitting of unaveraged spectra and inclusion of n-leaks in the fitted profile for more accurate data representation.

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Analysis and Progress of MWO Tower Studies - Ridge Fitting and Data Comparison

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  1. Status of MWO 60-Foot Tower f-Mode and Ring Diagram Analyses and Progress in High-Degree Ridge Fitting Edward Rhodes LoHCo Meeting Tucson, AZ December 14, 2005

  2. Progress in Analyzing MWO 60-Foot Tower Archive • Amount of Data Already Transferred to Stanford • Recent Progress in Extending Zonal Flow Studies Back to Solar Cycle 22 • Recent Progress in Generating Flow Maps from MWO Ring Diagrams in 1995, 1996, and 2001.

  3. MDI-Era 60-Ft Data Already Transferred to Stanford (as of August 31, 2005)

  4. Status of Pre-MDI Era 60-Ft Data already Transferred to Stanford (as of August 30, 2005)

  5. First MWO 60-Foot Zonal Flows from Solar Cycle 22

  6. First MWO 60-Foot Tower Flow Map from Pre-MDI Era

  7. Comparison of MDI and MWO 60-Foot Tower Flow Maps from 1996

  8. Comparison of MDI and MWO 60-Foot Tower Flow Maps from 2001

  9. Progress in Analyzing MWO 60-Foot Tower Archive • Comparison of MDI and MWO Flow Maps from 1996 and 2001 hav e demonstrated that 60-Foot Tower field of view rotates very slowly during each observing day. • GONG and USC software routines have been used to estimate this image rotation. • MWO flow maps have been generated with correction for changing p-angles. • These flow maps suggest geometric differences which we now are trying to understand.

  10. Comparison of MDI and MWO “Apparent” Short-term Position Angles Changes During One Observing Day

  11. Comparison of MDI and MWO “Apparent” Position Angle Changes During 2001

  12. “Uncorrected” July 1996 MWO Flow Map

  13. July 1996 MWO Flow Map with Wrong Sign of P-angle Correction

  14. Difference Between Original MWO July 1996 Flow Map and Map using Wrong Sign of P-angle Correction

  15. “Uncorrected” MWO Flow Map for July 4, 1996

  16. “Corrected” MWO Flow Map for July 4, 1996, Using Correct Sign of P-angle Correction

  17. Difference Between Original and Corrected MWO Flow Maps for July 4, 1996

  18. Corrected MWO Flow Maps for Entire Month of July 1996

  19. Recent Progress in Ridge-Fitting • Have Made Progress in the Fitting of both unaveragted and m-averaged power spectra. • Unaveraged spectra are now fit using much wider spatial leakage matrices to correctly include Woodard effect distortions. • Unaveraged spectra can now be fit for degrees between 45 and 1000. • Averaged spectra now include n-leaks in fitted profile. • Frequency errors have been greatly diminished in the fitting of unaveraged spectra.

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