tlb wrote:No, we were actually talking about visual effects at first; either a bow wave or large scale dust disturbances, as well as thermal effects.
I thought he meant the sensors that would detect the hyper transitions. That's what I meant when I said there's no telling how they would be affected by the dust clouds.
The EM sensors aren't very good at detecting stealth ships more than a light-second out. Even very finely tuned, orbital sensors wouldn't see anything more than a light-minute out. So those stealth ships shouldn't be worried about direct detection once they're in the bubble.
If you meant those sensors seeing the dust cloud disturbances and how the cloud itself would obscure the sensors, then I admit I hadn't thought of it. However, I don't think it matters, because the attacking stealth ship must exit the cloud into the bubble, at which point the cloud is not obscuring anything. The disturbance of its passage should be fairly visible, forming a clear tunnel and rippling out, plus the bowshock.
I'm also assuming such a ship made this portion of the transit ballistically. Any active drive would disturb the cloud far more: a thruster/reaction drive would push the cloud, and a tractor like the spider would probably pull on it (the latter is of course subject to the Plot Device).
The next problem I now realise is that this is probably VERY far away. It's at least a light-hour from the primary, probably two, possibly as much as 6, closing on the astropause. If those are light-speed sensors, a QRF would take N hours + 15 minutes to arrive, which could mean the stealth ship has left the region where the dust cloud would reveal it.