Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...324.1172l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 324, Jan. 15, 1988, p. 1172-1183.
Astronomy and Astrophysics
Astrophysics
46
Acoustic Frequencies, Doppler Effect, Solar Oscillations, Spatial Resolution, Stellar Spectrophotometry, Error Analysis, Spherical Harmonics, Vibration Mode
Scientific paper
Acoustic oscillations of the sun were observed at Big Bear Solar Observatory by measuring Doppler shifts at three different spatial resolutions, in order to measure the frequencies of solar p-modes at low, intermediate, and high values of spherical harmonic degree l. Distinct, sharply peaked spectral features were not identified in these data, and instead the positions of broad ridges in the l-v power diagram were measured, from which p- and f-mode frequencies were derived. A table of oscillation frequencies with l in the range of 30-132O is presented. Systematic errors in determining p-mode frequencies from ridge positions were examined for l less than 100 by comparing the measured ridge positions with frequencies obtained from the analysis of sharply peaked spectral features. This led to the identification of two types of systematic errors, which were subsequently removed from the data. Residual systematic errors in the measured frequencies are estimated for the three data sets.
Kaufman Michael J.
Libbrecht Kenneth G.
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