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Fig. 1.

image

Power spectra showing selected modes of oscillation in the Carrington frame. Each column corresponds to a particular m and velocity component, as indicated at the top. Each row shows a different representation of the power spectrum. Top row: the power spectral density is plotted as a function of frequency and latitude. The two blue curves show m(Ω − ΩCarr)/2π at the surface and at r = 0.95 R, where Ω(r, θ) is the solar angular velocity in the inertial frame. The purple contour delineates the region in frequency–latitude space affected by inflows into active regions, mAR − ΩCarr)/2π (see Fig. C.1). Second row: the power at each latitude is normalized by its average value over the frequency range between the red bars; this shows that each mode has excess power over a large range of latitudes. The red arrows point to the critical latitudes of ±38° at the surface for the mode with frequency −73 nHz. Third row: the power is averaged over the selected latitude bands specified on the plots, and the frequency resolution is reduced to 12.24 nHz. The red dots point to modes that are not activity-related (see text) and they are listed in Table A.1.

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