Computer Science
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.517..145k&link_type=abstract
In: Proceedings of SOHO 12 / GONG+ 2002. Local and global helioseismology: the present and future, 27 October - 1 November 2002,
Computer Science
Helioseismology, High-Degree Ridge Fitting
Scientific paper
High degree power ridges (up to l = 900) were computed and fitted for several two to three-month-long time-series of full-disk observations taken with the Michelson Doppler Imager (MDI) on-board the Solar and Heliospheric Observatory between 1996 and 1999. A detailed discussion of the modeling of the ridge power distribution, and the contribution of the various observational and instrumental effects on the spatial leakage, in the context of the MDI instrument, are presented. The result of this work is a better understanding of the problems associated with the characterization of high degree modes. We present the instrumental and observational requirements needed to achieve a determination of high degree mode frequencies whose residual systematic errors associated with the accuracy of the ridge to mode correction scheme are smaller than the uncertainty of the fitting itself.
Korzennik Sylvain G.
Rabello-Soares Cristina
Schou Jesper
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