Yes, somewhat. There is some informatioin available on various web sites. There are a number of these around the world. All they really are, from my understanding, is high altitude atmospheric heaters (they heat up a protiion of the ionosphere with focused microwaves). They are used to do everything from alter weather patterns to deep earth tomography and over the horizon radar according to some sources. I actually inquired about these things to the HARP people a number of years back and they denied anything except some rather esoteric high atmosphere studies were being conducted or even possible. All those things being attribituted to them by the tinfoil hat crowd would be apparent by now if they were true. BTW, you can hear it on a shortwave receiver when in operation. Don't remember the frequency, but is is on the lower end of the bands commonly on shortwave receivers. Just a sort of humming clicking sound, a bit like the old Russian woodpecker thing.