We report observations of stimulated electromagnetic emission (SEE) induced by high power high frequency (HF) radio waves near the third electron gyroharmonic (3) at European Incoherent Scatter Radar (EISCAT). It is discovered that stimulated Brillouin scattering (SBS) spectrum behaves similarly as spectral ion lines of the incoherent scatter radar (ISR) for HF pumping frequency above 3. The SBS spectral width shows correlation with electron to ion temperature ratio T_e/T_i. A new inversion method is proposed by incorporating the SBS spectral width within an artificial neural network approach to achieve electron temperature inversion for ionospheric turbulent plasmas. This work provides a potential new technique to diagnose parameters in the modified ionosphere when the ISR is not available.

中文翻译：

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一种高功率无线电波修正电离层电子温度的受激发射诊断技术

我们报告了在欧洲非相干散射雷达 (EISCAT) 上的第三电子回旋谐波 (3) 附近的高功率高频 (HF) 无线电波诱导的受激电磁发射 (SEE) 的观察结果。发现受激布里渊散射 (SBS) 光谱的行为类似于非相干散射雷达 (ISR) 的光谱离子线，用于 HF 泵浦频率高于 3 。SBS 谱宽显示与电子与离子温度比T _e / T _{i的相关性}. 提出了一种新的反演方法，将 SBS 谱宽结合到人工神经网络方法中，以实现电离层湍流等离子体的电子温度反演。当 ISR 不可用时，这项工作提供了一种潜在的新技术来诊断修改后的电离层中的参数。