8- 20 MHz极向中纬度雷达无线电噪声的季节和日动态
Seasonal and diurnal dynamics of radio noise for 8-20MHz poleward-oriented mid-latitude radars
摘要：
基于IRI-2016模型描述的平滑电离层射线追踪，我们推导了四个中纬度高频雷达观测到的无线电噪声的季节-日动态。在计算中，假设噪声从雷达死区边界传播。沿着射线路径的噪声吸收是根据IRI-2016电子密度以及从NRLMSISE-00模型获得的分子氮密度和电子温度来模拟的。模型结果与实验雷达数据进行了比较，两者之间的良好协议被证明。该模型使得有可能估计在平均未受干扰的条件下D-和E-层的吸收量。这对于反演低电离层电子密度的长期变化是很重要的。该模型还使解释实验数据中的垂直吸收成为可能，从而大大扩展了高频雷达监测低电离层的能力。
英文摘要：
Based on ray tracing in a smooth ionosphere described by the IRI-2016 model we have infered the seasonal-diurnal dynamics of radio noise observed by four mid-latitude HF radars. In the calculations, noise is assumed to propagate from the radar dead zone boundary. Noise absorption along the ray path is simulated from the IRI-2016 electron density, and from the molecular nitrogen density and electron temperatures obtained from the NRLMSISE-00 model. Model results are compared with experimental radar data, and good agreement between the two is demonstrated. The model makes it possible to estimate the amount of absorption in D- and E- layers under average undisturbed conditions. This is important for the retrieval of long term variations in the electron density in the lower ionosphere. The model also makes it feasible to interpret vertical absorption in experimental data, thereby significantly expanding the capability of HF radars to monitor the lower ionosphere.
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