Ooooh, you have a good one there. well done.
Yes, the streams should rotate as the comet nucleus rotates the active area. assuming its not 100% active. So, on a longer sequence you seem to have the rotation going from the lower half to higher half.
This is very similar to what ISON did over a day in STEREO images, see this small avi at my blog ,
http://cometal-comets.blogspot.com.a...omet-ison.html
at this updaate - ISON Enters HI1A 20131120
kind regards, Alan