There is no animation for this.It is a auto-generated thing, much like the ION lightning. You can define some parameters though - In rules.ini look for a section that looks like this:
CODE
; Controls for radar events
; The events, in order, are:
; (1) Generic Combat Event,
; (2) Generic Noncombat Event,
; (3) Dropzone Event,
; (4) Base Under Attack Event,
; (5) Harvester Under Attack Event,
; (6) Enemy Object Sensed Event
; So, for example, to change the visibility duration of the Harvester Under Attack Event,
; you would change the fifth number in the list for RadarEventVisibilityDurations
;
RadarEventSuppressionDistances=8, 8, 8, 8, 8, 6 ; suppression distance in cells
RadarEventVisibilityDurations=200,200,200,200,200,200 ; event visibility in frames
RadarEventDurations=400,400,400,400,400,400 ; event duration in frames
FlashFrameTime=7
RadarCombatFlashTime=49; this should ALWAYS be an odd multiple of FlashFrameTime, ie RadarCombatFlashTime / FlashFrameTime should be an odd number
RadarEventMinRadius=8
RadarEventSpeed=1.2
RadarEventRotationSpeed=.05
RadarEventColorSpeed=.1