We present the results of experimental studies of the generation peculiarities and features of the Langmuir and ion–acoustic turbulence in the F region of the high-latitude ionosphere excited by high-power HF O-mode radio waves emitted by the EISCAT/Heating facility (Tromso, Norway) in the direction of the Earth’s magnetic field. The experiment was carried out at frequencies fH close to the fourth gyroharmonic, fH < 4fce, and the cutoff frequency of the F2 layer, foF2 , fH < foF2 < fH+fce/2, where fce is the electron gyrofrequency. By using the EISCAT incoherent scatter radar (930 MHz), a joint analysis of the plasma and ion line spectra simultaneously below and above the F2-layer maximum was performed. The excitation of the HF-induced plasma lines outshifted by 0.35–0.45 MHz from the pump-wave frequency and HF-enhanced ion lines simultaneously below and above the F2-layer maximum was found for the first time. The mechanisms of the pump-wave propagation to altitudes above the F2-layer maximum and a plausible mechanism for the excitation of the instability responsible for the generation of HF-enhanced ion lines and HF-induced plasma lines above the F2-layer maximum are discussed.

中文翻译：

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高纬度电离层中朗缪尔和离子-声学湍流由同时低于和高于 F2 层最大值的高功率 HF 无线电波激发

我们展示了由 EISCAT/加热设施发射的高功率 HF O 模式无线电波激发的高纬度电离层 F 区朗缪尔和离子声湍流的产生特性和特征的实验研究结果（特罗姆瑟，挪威）在地球磁场的方向。实验在接近第四次回旋谐波的频率 fH 下进行，fH < 4fce，以及 F2 层的截止频率，foF2，fH < foF2 < fH+fce/2，其中 fce 是电子回旋频率。通过使用 EISCAT 非相干散射雷达 (930 MHz)，同时对 F2 层最大值下方和上方的等离子体和离子线谱进行了联合分析。HF 诱导的等离子体线的激发超出了 0.35-0。首次发现泵波频率和 HF 增强离子线同时低于和高于 F2 层最大值的 45 MHz。讨论了泵浦波传播到高于 F2 层最大值的高度的机制，以及激发不稳定性的可能机制，该不稳定性负责产生高于 F2 层最大值的 HF 增强离子线和 HF 诱导的等离子体线.