Frequencies of solar p-mode oscillations

Abstract

Acoustic oscillations of the Sun were observed by measuring Doppler shifts at Big Bear Solar Observatory in 1985 and by measuring intensity fluctuations at the geographic South Pole in 1981. These data are reduced to spectra in frequency and spherical harmonic degree, l, by averaging over azimuthal order after removing frequency shifts caused by rotation. Distinct spectral features are identified and fitted with models to produce estimates of multiplet frequencies and errors. The authors present a table of measured frequencies for 4 ≤ l ≤ 99, with measurement uncertainties of the order of one part in 10<SUP>4</SUP>. Tables of published frequency measurements for l ≤ 5 are also included.