Accurate characterization of high-degree modes using MDI data

We present the first accurate characterization of high-degree modes (i.e., ℓ up to 1000), using the best MDI full-disk full-resolution data set available (90-day long time series, acquired in 2001). The Dopplergrams were spatially decomposed using our best estimate of the image scale and the known c...

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Bibliographic Details
Published in:Journal of physics. Conference series 2013-01, Vol.440 (1), p.12016-6
Main Authors: Korzennik, S G, Rabello-Soares, M C, Schou, J, Larson, T
Format: Article
Language:English
Subjects:
Amplitudes
Asymmetry
Distortion
Estimates
MDF
MDI
Physics
Power spectra
Time series
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Summary:We present the first accurate characterization of high-degree modes (i.e., ℓ up to 1000), using the best MDI full-disk full-resolution data set available (90-day long time series, acquired in 2001). The Dopplergrams were spatially decomposed using our best estimate of the image scale and the known components of MDI's image distortion. Multi-tapered power spectra were fitted for all degrees and all azimuthal orders, between ℓ 100 and ℓ 1000, and for all orders with substantial amplitude. Fitting at high degrees generates ridge characteristics, characteristics that do not correspond to the underlying mode characteristics. We used a sophisticated forward modeling to recover the best possible estimate of the underlying mode characteristics. We have derived a final set of corrected mode characteristics (frequencies, line widths, asymmetries and amplitudes) and their uncertainties.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/440/1/012016