Studies of Solar Internal Structure & Dynamics Using High-Degree p-Mode
Observations from the SOHO MDI Full-Disk Program

E.J. Rhodes, Jr.
Univ. of Southern Calif.

J. Schou, and J. Reiter

The internal thermodynamic structure and dynamical motions of the 
solar interior will be studied through the inversion of high-degree 
p-mode frequencies and frequency splittings computed from the 
Full-Disk observing program of the SOHO MDI experiment.  P-mode 
frequencies and frequency splitting extending up to spherical 
harmonic degrees of 1000 will be produced from the observed 
velocity and intensity power spectra.  These frequencies and 
splittings will then be inverted to obtain information about the 
radial thermodynamic structure of the solar interior and about 
the three-dimensional angular velocity profile there.  The high-degree
p-mode frequencies will be computed initially using software which 
was developed during the second year of the SOHO mission by the 
Principal Investigator and the Co-Investigators.  These frequencies 
will be refined later using new software which is currently under 
development.  The software which will be used to produce the 
high-degree splittings is also currently under development.  
Additional information about the structure of the solar atmosphere 
will be obtained by comparing simultaneous frequencies obtained 
at two different heights in the solar atmosphere.  The second set 
of observations for these latter studies will be observations taken 
at the 60-Foot Solar Tower of the Mt. Wilson Observatory during the 
1996 and 1997 Dynamics Runs of the MDI experiment.