Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.2202l&link_type=abstract
American Astronomical Society Meeting 210, #22.02; Bulletin of the American Astronomical Society, Vol. 39, p.124
Astronomy and Astrophysics
Astronomy
Scientific paper
In spite of the unprecedented success of the MDI Medium-l program, the global mode analysis pipeline is known to contain errors. Physical effects such as line assymmetry, horizontal displacement at the solar surface, and distortion of eigenfunctions have been ignored, as well as a wide array of instrumental effects. Additionally, certain improvements in the pipeline algorithm itself are possible, most notably in the gap-filling of time series. Perhaps unsurprisingly, some features of the results seem to be the effect of systematic errors. The most remarkable of these features are an annual variation in f-mode frequency changes, a bump in the normalized residuals of the a-coefficients around 3.4mHz, and polar jets in the inversions. In this poster we discuss the application of a variety of corrections to the analysis, the resulting changes in the mode parameters, and the effect on the magnitude of systematic errors. We also describe new software tools that been created to simplify and generalize the pipeline, making it of greater utility to anyone interested in global mode analysis.
This work has been funded by NASA.
Larson Timothy P.
Schou Jepser
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