Sunspot -- p-Mode Scattering Measurements Using Hankel and Time-Distance Techniques

Lead Investigator: Douglas C. Braun

Other Team Members: Thomas L. Duvall, Jr.

Abstract:

Our principal scientific objective is to measure the p-mode scattering properties of a few selected sunspots and plage regions using both the ``Hankel decomposition'' analysis and ``time-distance'' analysis. We will primary utilize the full disk Doppler images obtained by MDI-SOI during the 2 month/year Dynamics program for both the Hankel scattering (phase shift) measurements and the time-distance (travel time) mapping. Measurements of p-mode absorption by sunspots at very high degrees will also be made using one or more of the 8 hour ``High Resolution-Field'' scans made during campaign mode. The use of both the Hankel and time-distance analyses will enable a direct quantitative comparison between the two methods, which is necessary to understand and interpret the results obtained by both procedures.


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