This is just unbelievably good, awesome results!
Quark (Trevor)
In 2010 I also made several animations that show dark spots in the B-rings that I believed were spokes. It's difficult to say with absolute certainty, but for what it's worth (which might very well be nothing hehe) I'm about 99.9% convinced that the effects in those 2010 animations are real and not artefacts. I know how I processed those images, and animations do show a lot more than just still frames. If it was only a single image with a dark spot, then I would agree it is probably an artefact. But when you see the dark feature move around in subsequent stacks, then it is most likely something real.
You do need a steady seeing to show these kinds of features, and you have to process each of the stacks in exactly the same way. And you have to build animations to be (much more) sure, but then I think a lot more people can capture the spokes (when they are there!).
http://www.astrokraai.nl/getimage.php?id=310
http://www.astrokraai.nl/dump/201004...Saturn_RGB.gif
As you can see the effects are MUCH dimmer than in these images, but I haven't found a better explanation of what the dark spots are in the rings other than spokes.