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HF radar backscatter whichhas been artificially-induced by a high power RF facility such as the EISCATheater at Tromsø has been demonstrated to provide ionospheric electric fielddata of unprecedented temporal resolution and accuracy. Here such data are usedto investigate ULF wave processes observed by the CUTLASS HF radars. Within ashort period of time during a single four hour experiment three distinct wavetypes are observed with differing periods, and latitudinal and longitudinalphase evolution. Combining information from the three waves allows them to bedivided into those with a large-scale nature, driven externally to themagnetosphere, and those with small azimuthal scale lengths, driven bywave-particle interactions. Furthermore, the nature of the wave-particleinteractions for two distinct small-scale waves is revealed, with one waveinterpreted as being driven by a drift resonance process and the other by adrift-bounce resonance interaction. Both of these mechanisms with <i>m ≈ </i> -35 and proton energies of 35–45 keV appear to be viable wave energysources in the postnoon sector.  <b>Key words. </b>Ionosphere (active experiments;wave-particle interactions) – Magnetospheric physics (MHD waves andin-stabilities)

ULF waves with drift resonance and drift-bounce resonance energy sources as observed in artificially-induced HF radar backscatter