| |
 |
| 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. |
|
|
|
|
|
