The most prominent instrument at HAARP is the Ionospheric Research Instrument (IRI), a high-power radio frequency transmitter facility operating in the high frequency (HF) band. The IRI is used to temporarily excite a limited area of the ionosphere . Other instruments, such as a VHF and a UHF radar , a fluxgate magnetometer , a digisonde (an ionospheric sounding device), and an induction magnetometer, are used to study the physical processes that occur in the excited region.
The land that HAARP sits on still belongs to the USAF. The mechanism to transfer the land is through legislative action, specifically, the National Defense Authorization Act (NDAA). President Obama signed the fiscal year 2017 NDAA in December of 2016, which authorized approximately 1,158 acres and associated fixtures to transfer to the University of Alaska. UAF is currently working with the Army Corps of Engineers to complete the conveyance action.