The Solar Acoustic Spectrum and Eigenmode Parameters

Details The Solar Acoustic Spectrum and Eigenmode Parameters The Solar Acoustic Spectrum and Eigenmode Parameters

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...272.1292h&link_type=abstract

Science, Volume 272, Issue 5266, pp. 1292-1295

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119

Scientific paper

The Global Oscillation Network Group (GONG) project estimates the frequencies, amplitudes, and linewidths of more than 250,000 acoustic resonances of the sun from data sets lasting 36 days. The frequency resolution of a single data set is 0.321 microhertz. For frequencies averaged over the azimuthal order m, the median formal error is 0.044 microhertz, and the associated median fractional error is 1.6 x 10-5. For a 3-year data set, the fractional error is expected to be 3 x 10-6. The GONG m-averaged frequency measurements differ from other helioseismic data sets by 0.03 to 0.08 microhertz. The differences arise from a combination of systematic errors, random errors, and possible changes in solar structure.

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