The Uncanny Sight of Waves Breaking on a Star

I wouldn't recommend trying to vacuum fire... But if you were to do it, you would find you ended up with flames going all the way up your vacuum hose and into the dust collector.

So from that perspective, fire is very much vacuumable.

There are no dumb questions, only dumb answers - so here goes:

Hot things emit light. The wavelength(s) of light a substance emits depends on the temperature of that substance - cooler things emit longer (redder) wavelengths, hotter things are bluer. If the substance is cool enough, the light emitted will be mostly or wholly infra-red, therefore invisible to the naked eye but still detectable. The top of a flame is like that - the gas is still hot but no longer glowing visibly as it cools. Therefore the answer to your question depends on how hot the plasma is, but a confounding factor is that the hoovering object would create friction in the incoming material, thereby heating it up. I think the corona of a star glows with its own light (not just light emitted by the core), so I expect therefore that you would see a lot of light overall, especially nearer to whatever is doing the vacuuming.

A crashing wave where the crest leads the trough would be like when you're surfing inside of a barrel wave. The crashing part is going over your head and landing in the trough.

In the case of this star simulation they are saying that the wave is crashing, but the crashing part is falling back on the back side of the wave instead of going forward over your head.