The visible optical power emitted from the expansion plumes from 0.4 a
nd 2 km diameter fragments of Shoemaker-Levy are expected to be, appro
ximately 25% and comparable to, the visible solar flux reflected from
Jupiter, respectively, for several minutes, and could be easily observ
ed by sensors on the Galileo spacecraft. Earth-based observers can det
ect these plumes as these expand over the SW limb of Jupiter and come
into earth view some n-minutes after impact!