OK, have just returned from pointing my flashlight at Saturn (I'm in the UK - on the night-side). My arms are tired, my hair is full of midges, and I'm thirsty. In order words, I had a great bonding session with Cassini. :-) Hope my 2-watt LED flashlight didn't exceed ISS-NAC's brightness limits. ;-)
Does "driven outward from the arc by electromagnetic forces" mean that the dust-sized particles are electrically-charged? I got the impression from the original press release that plasma forced the particles out (although the release doesn't say how, I thought it might be due to ram-pressure from the gas).