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Fig. 4.

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Wavelet power spectrum of the Doppler velocity averaged over 3 × 3 pixels at the center of the oscillation patterns. The black dashed line represents the time t = 0 at 17:43:27 UT, which is the middle time of the wave packet of spiral-shaped wave patterns. The red contour indicates the 95% confidence level, and the hashed region shows the cone of influence. Among the total observing duration (of −3200 s to 780 s), the diagram shows only the time range of −780 s to 780 s.

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