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Paper: A Determination of High-degree Mode Parameters Based on MDI Observations
Volume: 462, Progress in Solar/Stellar Physics with Helio- and Asteroseismology
Page: 189
Authors: Korzennik, S. G.; Rabello-Soares, M. C.; Schou, J.; Larson, T. P.
Abstract: We present the best to date determination of high-degree mode parameters obtained from a ninety day long time series of full-disk full-resolution Michelson Doppler Imager (MDI) Dopplergrams. These Dopplergrams were decomposed using our best estimate of the image scale and the known components of MDI's image distortion. The spherical harmonic decomposition was carried out up to ℓ=1000, and a high-order sine multi-taper power spectrum estimator was used to generate power spectra. These power spectra were fitted for all degrees and all azimuthal orders, for 100 ≤ ℓ ≤ 1000, and for all radial orders with substantial amplitude, generating some 6 × 106 estimates of ridge frequencies, line-widths, amplitudes and asymmetries. We used a sophisticated forward modeling of the mode to ridge blending, to recover the best possible estimate of the underlying mode characteristics.
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