我国极区冬季电离层加热实验研究  

Observations of the heating experiments in the polar winter ionosphere

作　　者：徐彬[1] 吴军[2] 吴健[2] 吴振森[1] 车海琴[2] 许正文[2] 薛昆[1] 闫玉波[2] 

机构地区：[1]西安电子科技大学理学院,西安710071 [2]中国电波传播研究所电波环境特性及模化技术国家重点实验室,北京102206

出　　处：《地球物理学报》2009年第4期859-877,共19页Chinese Journal of Geophysics

基　　金：国家自然科学基金重点项目(40831062);国家科技支撑计划(2006BAB18B06);电波环境特性及模化技术国家重点实验室基金资助

摘　　要：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.According to the analysis of the ISR observation data, the heating effects in polar winter ionospheric modification experiments carried out in January 2008 at TromsФ, 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-tovalley 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.

关 键 词：电离层加热 非相干散射雷达 电子温度增强 功率谱 

分 类 号：P352[天文地球—空间物理学]