H.A.A.R.P, that is High Frequency Active Auroral Research Program was initiated in 1993. And, as its all known all over the World, it was setup in the region of Alaska, North America. Though, the whole concept was inspired by Nikola Tesla's research work.
The, research work is funded by the military forces of US. The, prime motive is to deeply understand the happenings in the Ionosphere or Thermosphere. Basically, this layer is highly conductive as free ions are present there in abundance. So, what H.A.A.R.P does is, that it directly sends powerful radiowaves of extremely high frequency from the ground base; from the place where the the whole antenna setup of this H.A.A.R.P project is setup. And, this inturn in a way highly randomizes the whole negative ions layer up in the Ionosphere region and it has been stated in various technical papers that the temprature, during this highly randomized time period of Ions in this layer or we should actually say; highly disturbed time, can reach upto (50k Deg.'s F or 50,000 Degrees Fahrenheit) or 27,760 Deg. Celcius.
Self Explanatory Image of Various Atmospheric Layers
According, to United States Patent, Patent #US004686605 one of antenna number 15 which upon being coupled to the transmitter 16 generates a beam of high frequency of elecromagnetic radiation; at a wide range of discrete frequency, that is from 20 to about 1800 Kilohertz (kHz).
It's about one of the antenna that i talked about. In, actual its all of highly advanced, high frequency energy tranmitter setup installed. As, the name say High Frequency Active Auroral Research Programme, though they say that it's just a research programme. But, in real it's full fledge experiments going on. Which, is interferring in the path of the way the Nature does it works. It's also said that, with the sccess in H.A.A.R.P they can actually raise the height of ionosphere layer. And, now i would say it is no doubt that this will surely hamper the ozone layer. As, Ozone layer is below the Ionospher layer. So, slight change Ionosphere's height will create problem for whole of the environment.
Radio waves transmision and then recieving the same by H.A.A.R.P