Figure 8.

Extremely long, curved features detected in PJ20. Two unusually long features that may be waves were detected near the southwestern extension (“festoon”) of a 5‐μm hot spot, seen here as the dark area. North of the dark area of the festoon is a pair of lines, whose beginnings and ends are marked by white arrows. Among the many waves found south of the festoon, is a set of three closely spaced parallel lines, noted by the arrows that do not begin or end at the same position. Only for two of them is the western end evident. We note that some mild unsharp masking has been applied to this image in order to resolve for the reader the three dark curves at their eastern ends. (The locations of many more of the waves present in this figure are indicated in Figure PJ20_34 in the supporting information.)