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S. Kras, R. Howe, R. Komm, F. Hill (NSO)
We reprocessed all 59 108-day time series obtained during the operation of GONG in `classic' mode (mid-1995--mid-2001) using multitapers. The multitaper method helps to improve the fitting of mode parameters by producing smoothed power spectra. The main benefit is an increase in the number of modes that are fitted well, which leads to an increase of the order of 10%\ in the number of multiplets for each time sample. We will compare multitapered with previous untapered results to show the improvement gained, for example, in the rotation rates of the solar interior by this reprocessing step. In addition, we analyzed 1-year and 3-year GONG classic time series in order to improve the number of well-fitted modes at low frequencies (below 1.5 mHz). Preliminary results show an improvement in the number of modes at low frequencies is gained by increasing the length of the time series from 108 days to three years. We will present our latest results.
The Global Oscillation Network Group (GONG) project is managed by the National Solar Observatory, which is operated by AURA, Inc. under a cooperative agreement with the National Science Foundation.
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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.