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High Frequency Active Auroral Research Program
The most prominent instrument at the HAARP Station is the Ionospheric Research Instrument (IRI), a high-powerradio 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 aUHF radar, a fluxgate magnetometer, a digisonde (an ionospheric soundingdevice), and an induction magnetometer, are used to study the physical processes that occur in the excited region.