grl25436-sup-0001-m01.mpgMPEG video5418KAnimation S1. Consecutive images from the INCA ENA imager for energetic hydrogen atoms (20–50 keV). The format is the same as that in Figure 1 of the paper. Each image represents a 1 hour average of INCA data. The white diagonal line in each frame indicates the linear fit of contour peaks, which delineates the center of Saturn's plasma sheet. This line tilts up and down with the rotation period of the planet.

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