Thermal response of the F region ionosphere in artificial modification experiments by HF radio waves
Thermal response of the F region ionosphere in artificial modification experiments by HF radio waves
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DOI：
10.1029/ja086ia02p00561
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发表时间：
1981-02
影响因子：
--
通讯作者：
G. P. Mantas;H. Carlson;C. Lahoz
中科院分区：
文献类型：
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作者：
G. P. Mantas;H. Carlson;C. Lahoz
利用波多黎各阿雷西博的非相干散射雷达观测了夜间F区电离层对高频无线电波局部加热的热响应。在大功率高频发射机开关周期为240 s的情况下，观测到高分辨率的电子温度时空变化。HF发射机一开启，电子温度在F2层峰值以下300 km附近的狭窄高度区域内开始迅速上升。电子温度扰动随后扩散到更广泛的海拔区域。将观测结果与基于电子和复合离子气体的耦合时间相关热传导方程数值解的电离层热响应预测结果进行了比较，发现在观测所覆盖的整个高度区域内，两者的预测结果非常吻合。计算表明，热传导是导致电子温度增强扩散到无线电波能量沉积区域外的原因。他们还表明，当电子温度比其平衡值提高40%或更多时，离子温度会发生较小的但实验上可观察到的增强。对于所提供的数据，他们还显示电离层吸收了大约一半的辐射HF能量，异常吸收大致等于偏差吸收加热。
The thermal response of the nighttime F region ionosphere to local heating by HF radio waves has been observed with the incoherent scatter radar at Arecibo, Puerto Rico. The observations consist of high-resolution space and time variation of the electron temperature as a high-power HF transmitter is switched on and off with a period 240 s. As soon as the HF transmitter is turned on, the electron temperature begins to rise rapidly in a narrow altitude region near 300 km, below the F2 layer peak. The electron temperature perturbation subsequently spreads over a broader altitude region. The observations are compared with the anticipated thermal response of the ionosphere based on numerical solutions of the coupled time-dependent heat conduction equations for the electron and composite ion gases and are found to be in good agreement over the entire altitude region covered by the observations. The calculations show that heat conduction is responsible for the spreading of the electron temperature enhancement outside the region where the radio wave energy is deposited. They also show that a smaller, but experimentally observable, ion temperature enhancement takes place while electron temperatures are enhanced by 40% or more of their equilibrium values. For the data presented they also show ionospheric absorption of roughly half the radiated HF energy, with anomalous absorption roughly equal to deviation absorption heating.