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The Fast Auroral Snapshot Explorer (FAST)satellite detected intense and coherent 5–20 m electric fieldstructures in the high-latitude topside auroral ionosphere betweenthe altitudes of 350 km and 650 km. These electric fieldsappear to belong to electrostatic ion cyclotron (EIC) waves interms of their frequency and wavelengths. Numerical simulations ofthe response of an electron plasma to the parallel components ofthese fields show that the waves are likely to excite awave-driven parallel ion acoustic (IA) instability, through thecreation of a highly non-Maxwellian electron distribution function,which when combined with the (assumed) Maxwellian iondistribution function provides inverse Landau damping. Because thecounter-streaming threshold for excitation of EIC waves is wellbelow that for excitation of IA waves (assuming Maxwellianstatistics) our results suggest a possible two step mechanismfor destabilization of IA waves. Combining this simulation resultwith the observational fact that these EIC waves share acommon phenomenology with the naturally enhanced IA lines (NEIALS)observed by incoherent scatter radars, especially that they bothoccur near field-aligned currents, leads to the proposition thatthis two-step mechanism is an alternative path to NEIALS

Enhanced ion acoustic lines due to strong ion cyclotron wave fields