Fig. 5

Amateur images of Saturn with south pointing upward from February and March 2008. Left panel: RGB image of Saturn taken by Jean-Jacques Poupeau on 23 February 2008, 23:47 UT. The prominent cloud feature close to the central meridian is the storm cell F1. The faint cloud feature about 20° westward of F1 is marked with red lines, and this is spot S3 as discussed in the text. Right panel: Saturn image in green filter taken by Maximo Suarez on 6 March 2008, 23:20 UT. The magnified inset panel shows four features named A, B, C, and D, where the latter is questionable. Feature A corresponds to storm cell F1 with feature B being a westward extension of A. Feature C corresponds to spot S3.
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