Figure 2
From: 30-min decayless kink oscillations in a very long bundle of solar coronal plasma loops
Periodicities of the observed decayless kink oscillations. (a1–c1): Time series of oscillatory displacements extracted from the time–distance maps shown in Fig. 1c–e, with the background trend subtracted. (a2–c2): Wavelet power spectra normalised to their maxima. (a3–b3): Global wavelet power spectra. The black thick contour is the 95% confidence level. The orange curves indicate the global 95% confidence level. The filled hatch is the cone of influence.
