Average (stacked) images of the apparent vortex area in HMI (top row) and Hα −1.03 Å (bottom row) for certain similar time intervals. The first column shows an average image of the entire observed second time series, while the other columns show average images for shorter time intervals within the second time series that are denoted within each image. The overplotted yellow circle indicates the location of the analysed conspicuous vortex flow as seen in Hα .
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