我国极区冬季电离层加热实验研究

通过对非相干散射雷达观测数据的处理分析，研究了2008年1月我国在挪威Troms进行的冬季电离层加热实验效应.研究结果表明，电离层临界频率大于泵波频率的O波加热事件扰动效应明显，电子温度存在60%~120%的增强，扰动范围从150 km一直延伸到400 km，电子密度扰动不显著，最大可以观察到12%的密度衰减.受加热影响，离子声波频率有1~2 kHz的增加，离子线谱峰谷比增加，有时伴随有高阶谐振线出现.离子线和等离子线功率存在过冲现象，等离子线的功率剖面存在单峰、双峰和三峰结构，等离子线的功率增强幅度随频率负指数衰减.

Observations of the heating experiments in the polar winter ionosphere

According to the analysis of the ISR observation data, the heating effects in polar winter ionospheric modification experiments carried out in January 2008 at Troms, Norway were studied. A clear disturbance effect is present under the O-mode over-dense heating conditions. The enhancement of the electron temperature is up to 60%~120%, extending from 150 km to 400 km；The disturbance of the electron density is not obvious, with a 12% maximum decrease. A 1~2 kHz increase in the acoustic frequency can be observed, an enhancement in the peak-to-valley ratio of the ion line and sometimes its high-order harmonics can be seen as well. The power of the ion line and plasma line has shown overshoot effect, single-humped, double-humped and triple-humped structures have appeared in the power profile of plasma line, and the enhancement in power amplitude of the plasma line decreases exponentially as the frequency increases.