On midnight mars browser over the last week or so I keep getting long sequences of very low resolution images from spirit's microscopic imager that look like noise, though if you flip through them rapidly you see correlation between successive frames. Does anyone know what these are, and what the scientific purpose of the observations is?
For example, http://marsrovers.jpl.nasa.gov/gallery/all...00P0068M1M1.JPG
is in the middle of one such sequence.