Development Plan & Status

The current plan approved at the SOI Team Meeting, Fallen Leaf Lake (10/10/94)

The Medium-l Program

The plan is to:

• develop and implement into the IP software the uniform binning scheme with square bins of 5x5 CCD pixels each covering a central circular area of diameter about 90 Gaussian smoothing as an option; this `GONG-like' scheme will be used during the first 4-6 months of continuous observation; Sylvain Korzennik and Kosovichev will test the scheme using continuous South-Pole data of several-days duration to be provided by Tom Duvall;
• develop techniques and software for analysing binned data using a `stacking' method for the decomposition of the spatial eigenfunctions (possibly with `antialiassing' features), which will be used in parallel with the `Fourier-tachometer'-type analysis being developed by Jesper Schou for the High-l Program; time-series analysis will be performed using the High-l pipeline, and also, at the recommendation of several participants of the meeting, a 'ridge-fitting' technique which provides `peak-bagging' for modes of higher degree will be developed;
• investigate nonuniform binning schemes and test them using the South Pole data;
• investigate procedures for frequently (e.g. once a day) changing binning schemes as a possible replacement for on-board remapping;

It has been decided to:

• develop pipeline software for simultaneous `primary' inversions of the mean frequencies of the multiplets and of the coefficients of expansion of the symmetrical part of multiplet splitting into a set of orthogonal functions;
• develop the pipeline resources for `secondary' inversions, in particular, consistent sets of tables, on fine grids, of the equation of state and opacity coefficient in collaboration with Werner Däppen and Forrest Rogers;
• develop an IDL graphical user interface to the inversions programs as part of the inversions workbench, in collaboration with Peter Giles; investigate possibilities of using IBM Visualization Data Explorer and IRIS Visualization Explorer as platforms for the inversions pipeline; develop a `1x1' inversion technique for axisymmetrical structure inversions in collaboration with Takashi Sekii; the 2D part of the pipeline will also include 2D Abel inversions by the fractional differentiation technique; develop principles of 3D structure inversions in collaboration with Jean Perdang;
• investigate possibilities of including the solar modelling package by Richard Sienkiewich, Bogdan Paczinski and John Bahcall into the inversions pipeline.

It has been stressed that contributions to the development of the Medium-l Program and to the Structure Inversions Pipeline by both the members of the SOI Team and by others interested in the project would be very useful. Interested parties are urged to contact the Local Coordinator.