Panel a): time distance (TD) map formed from the slit along the path of intensity enhancements, between points F1 and F2, shown in Fig. 1. The intensity profiles labelled P1 and P2 show the intensity profile at different positions along the slit, and the green arrows indicate the position of main peaks, labelled E1−E6. Panel b): a TD map formed from a slit along the path of intensity enhancements in the running difference images. The diagonal green lines show the propagating intensity enhancements, and the dashed vertical lines indicate the enhancements where no propagation is seen. Box B1 highlights a series of shorter path, shorter period enhancements. Panel c): an intensity time series extracted from D in panel b), the intensity enhancements E1−E5 are labelled (E6 is missed as it is not prominent at the chosen distance along the slit). Panel d): Morlet wavelet spectra for the intensity time series, showing the distribution of the oscillation power with period as a function of time. The time axis of the four panels refers to the time elapsed since 22:00 UT.
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