Definitions for "Scintillate"
To sparkle, as the fixed stars.
reflect brightly; "Unquarried marble sparkled on the hillside"
emit or reflect light in a flickering manner; "Does a constellation twinkle more brightly than a single star?"
To emit sparks, or fine igneous particles.
give off; "the substance scintillated sparks and flashes"
physics: fluoresce momentarily when struck by a charged particle or high-energy photon; "the phosphor fluoresced"
Keywords:  radar, shift, rapidly, spot, display
It is a term used to shift rapidly a spot of light or image on a radar display around a mean position.