Okay, so I'm watching the History Channel the other night, and they're talking about futuristic weaponry. It was kinda cool. Then they start talking about microwaves. They said that a missile packed with microwaves could destroy all technology in America. That got me to thinking...
Noise, in large enough amounts, can destroy technology, right? Granted, emitted noise is only in minuscule amounts, not enough to do anything, really. But look at the Jamming that King did. That did some damage, because anyone caught in the noise could've died due to radiation or something. And Meteor G is a massive conglomeration of Noise. If that collided with Earth, 80% of all life, and all technology, would perish. Judging from what I heard, if a meteor made solely of microwaves collided with Earth, the result would probably be the same. And our cell phones and stuff emit radiation in minuscule amounts. And in the future, the era of Star Force, almost everything is endowed with technological enhancements, thus it emits radiation. Since Noise and Microwaves (a wave on the electromagnetic, or EM, spectrum) have the same properties, or so it seems, it leads me to believe that Noise is microwave radiation left unchecked. And since Mega Man is this series is an EM being, it makes sense that he can pulse into Noise (Microwave) waves. Pardon the redundancy.
tl;dr Noise=Microwave radiation.