Fig. 1
Comparisons of m-averaged power spectra between MDI (blue) and HMI (red) obtained from one-day tracked Dopplergrams. The upper panels show the power as a function of frequency at selected harmonic degrees: a) ℓ = 100 and b) ℓ = 300. The lower panels show the power as a function of harmonic degree at selected frequencies: c) 3.0 mHz and d) 4.0 mHz. Selected modes have been labeled. The power is normalized by the square of the number of frames.
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