QUOTE (ynyralmaen @ May 19 2010, 11:46 AM)
the large plume jet on the right is all beyond the local horizon and illuminated all the way down to the horizon as seen from Cassini, the middle one straddles the limb so that only part of it is in shadow, while the source of the left-hand jet is in darkness, i.e. closer to Cassini than the limb, and it only becomes visible when it emerges into sunlight.
I think I agree. One thing I'd add is that it seems like much of the bright plumes aren't in direct sun, but are illuminated by scattered light, perhaps from the sunlit parts of the plume, or perhaps from Saturn. I've indicated with the black arrow a notch in the central bright plume that aligns with the shadow heading off to the lower left. Presumably below the notch (in the image's orientation) the plume's in full sun, and above (closer to Enceladus) it's lit by scattered light:
Click to view attachmentI'm still puzzled by the appearance of the left plume, in particular why is it's upper right edge oriented the way it is?
And I think I can see the central plume in the Enceladus/Titan/rings frame, circled here:
Click to view attachmentIt's extremely subtle, which I guess is what you'd expect. When the exposure is set for Titan and the rings, the plumes are extremely faint.