Comparison of 1983 and 1979 SCLERA observations

In this work solar equatorial differential radius observations obtained between 30 May and 20 July 1983 are analyzed for evidence of solar oscillations. Previous work has produced acoustic mode classifications based on 1979 differential radius observations. By applying small frequency shifts to the n=1, iota=4,...,22 multiplets they find a statistically significant correspondence between 182 frequencies of the classified multiplet spectrum and the 1983 power spectrum. The measures Dij(m) of the azimuthal dependence of the eigenfunctions are also used to compare the 1983 and 1979 observations. Weighted average Dij's calculated for the peaks in the 1983 power spectra that matched previously classified modes were found to be consistent, at a statistically significant level, with those obtained for the 1979 observations. Modes with iota=8,...12 were used to calculate a weighted average value for the angle between an internal axis of symmetry and the pole of the Sun