help - flash graphic?

[Phoenix100]

See the pic below. What does this graphic mean? I can't find it in the manual. I guess it's obvious - it's an explosion of some sort. But what sort? I don't hear explosions when these graphics appear. So, not so obvious to me. Sorry. Anyone know?

[22sec]

Your forces are being shot at, although they have not spotted the actual unit doing the shooting. Basically they are seeing the muzzle flashes.

[Phoenix100]

Ah. Cool. Thanks, 22sec.

[Veitikka]

From the manual:

5.1.29. Muzzle Flash Detection

Muzzle flashes can be detected from a long distance, especially at night. Every type of ammunition has a ‘muzzle signature’ value that affects the detection chance. The exact position is not revealed, but an estimated area where the firing unit is shown. For example, a scout helicopter can see the on-map mortar muzzle flashes, and then artillery can be used to deliver flares to illuminate the area.