Paper:	Mode Frequencies from GONG, MDI, and HMI Data
Volume:	478, Fifty Years of Seismology of the Sun and Stars
Page:	137
Authors:	Korzennik, S. G.
Abstract:	I present recent results from fitting all the available data from the three major helioseismic instruments: GONG, MDI and HMI using my independent methodology. This method not only fits individual singlets, but: fits them simultaneously for a given multiplet; uses an optimal multi-taper spectral estimator; includes the full leakage matrix and the effect of mode distortion by differential rotation; and fits an asymmetric mode profile. The mode fitting was carried out on time series of varying lengths (1×, 2×, 4×, 8×, 16×, 32×, 64× 72 days long), using co-eval epochs for all three instruments. By fitting time series of varying lengths, one trades off some temporal resolution for a better precision. I present these results, compare them and discuss the potential sources of the discrepancies.

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