Time-Distance Development Plan & Status

Team Coordinator: Tom Duvall


1. The module for region tracking developed for the ring diagrams
   can be used for this program.  There are some local analyses that
   could benefit from sampling in a polar coordinate system centered
   on the tracked region which will require some additions to the 
   track_region program.

2. The remainder of the analysis up to the computations of the travel
   times is currently done in IRAF.  This will need to be incorporated
   into a strategy module.  The compiled parts of this code are not
   currently using the R8800 architecture adequately.  The most 
   time-consuming part of the analysis, the crosscorrelations, could
   benefit by a recoding in C or by a new version of IRAF (supposedly
   to be ready sometime this year).

3. Inversion has not been done yet on this problem.  Actively working on
   the problem are S. D'Silva and A. Kosovichev.

4. Analysis up to the travel time determination has been done with
   17 hours of South Pole data from Jan. 1991.  Signatures of wave
   speed variations and flows have been detected associated with
   active regions.  Some further analysis to try to optimize the spatial
   resolution of the results will be useful.

5. It would be useful to analyze some higher resolution data, say from
   La Palma, to see what useful things might be seen.  In the above-
   mentioned South Pole study, there was not enough spatial resolution
   to resolve supergranulation.  It would be very exciting to be able
   to measure the subsurface supergranulation flow and any associated
   wave speed variations.

This page last reviewed 14 Aug 1995

Please address comments and questions to the Team Coordinator

Return SOI Team Science page

Return Return to SOI Main Page