We consider a new mechanism for the generation of short‐scale, λ∥ ∼ 10 cm, electron density fluctuations giving rise to plasma line enhancements measured by incoherent scatter radars in the auroral E region. It is explained as a coupling (conversion) of long‐scale Langmuir waves generated by precipitated electron beams with short‐scale ion‐acoustic waves. The latter are supposed to be driven by field‐aligned currents associated with the precipitation. This mechanism is most effective inside the thin layer of the enhanced plasma turbulence, named the plasma turbulence layer.
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Мишин et al. (1994) studied this question.
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