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Fig. 1


Panela): SDO/AIA 171 Å image during the observed event at 22:00.00 UT centred on the active region of interest (AR 12205). The green boxes show the fields of view used for Fig. 2 (solid) and Fig. 7 (dashed). Panel b): the analysed region at 22:40:12 UT, F1 and F2 show the apparent extrema of the propagation path of the observed periodic intensity enhancements along a funnel structure, and the blue fit shows the slit used in the analysis. The red points P1 and P2 indicate the positions at which the time series plotted in Fig. 4 were extracted from.

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