1. The solar acoustic spectrum and eigenmode parameters
- Author
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Hill, F., Stark, P.B., Stebbins, R.T., Anderson, E.R., Antia, H.M., Brown, T.M., Duvall, Jr., T.L., Haber, D.A., Harvey, J.W., Hathaway, D.H., Howe, R., Hubbard, R.P., Jones, H.P., Kennedy, J.R., Korzennik, S.G., Kosovichev, A.G., Leibacher, J.W., Libbrecht, K.G., Pintar, J.A., Rhodes, Jr., E.J., Schou, J., Thompson, M.J., Tomczyk, S., Toner, C.G., Toussaint, R., and Williams, W.E.
- Subjects
Solar oscillations -- Observations ,Stars -- Structure ,Science and technology ,Observations - Abstract
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[sup.-5]. For a 3-year data set, the fractional error is expected to be 3 x 10[sup.-6]. The GONG m-averaged frequency measurements differ from other helioseismic data sets ky 0.03 to 0.08 microhertz. The differences arise from a combination of systematic errors, random errors, and possible changes in solar structure., Several million resonant acoustic normal modes (eigenmodes) of the sun are excited stochastically in the subsurface turbulent layer. The frequencies v, amplitudes A, and characteristic widths γ of such modes, [...]
- Published
- 1996