Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT
Stimulated Brillouin scattering during electron gyro-harmonic heating at EISCAT
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EISCAT 电子陀螺谐波加热过程中的受激布里渊散射
DOI：
10.5194/angeo-33-983-2015
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发表时间：
2015-01-01
影响因子：
1.9
通讯作者：
Ruohoniemi, J. M.
中科院分区：
文献类型：
--
作者：
Fu, H. Y.;Scales, W. A.;Ruohoniemi, J. M.
抽象的。考虑了使用地面高功率高频无线电波在电离层修改实验期间产生的二次辐射--受激电磁辐射(SEE)的观测。高频有源极光研究计划(HAARP)设施能够在SEE光谱中产生受激布里渊散射(SBS)和受激离子伯恩斯坦散射(SIBS)形式的窄带SEE。使用欧洲非相干散射(EISCAT)加热器设备之前还没有报道过这样的窄带SEE谱线。这项工作首次报告了窄带SEE光谱的EISCAT结果，并将它们与以前在HAARP观察到的电子回旋谐波加热期间的SEE进行了比较。对实验SEE数据的分析显示，在2012年7月的EISCAT活动期间，观察到泵频率100赫兹以内的发射线，解释为SBS。实验结果表明，受激布里渊散射随着泵浦频率接近三次电子回旋谐波而增强。此外，对于不同的加热器天线波束角度，高频泵浦引起的Cutlass雷达后向散射在电子回旋谐波附近被抑制，而EISCAT/UHF雷达测量的电子温度增强减弱。这些新的窄带EISCAT观测的主要特征与HAARP以前的SBS测量大体一致。
Abstract. Observations of secondary radiation, stimulated electromagnetic emission (SEE), produced during ionospheric modification experiments using ground-based, high-power, high-frequency (HF) radio waves are considered. The High Frequency Active Auroral Research Program (HAARP) facility is capable of generating narrowband SEE in the form of stimulated Brillouin scatter (SBS) and stimulated ion Bernstein scatter (SIBS) in the SEE spectrum. Such narrowband SEE spectral lines have not been reported using the European Incoherent Scatter (EISCAT) heater facility before. This work reports the first EISCAT results of narrowband SEE spectra and compares them to SEE previously observed at HAARP during electron gyro-harmonic heating. An analysis of experimental SEE data shows observations of emission lines within 100 Hz of the pump frequency, interpreted as SBS, during the 2012 July EISCAT campaign. Experimental results indicate that SBS strengthens as the pump frequency approaches the third electron gyro-harmonic. Also, for different heater antenna beam angles, the CUTLASS radar backscatter induced by HF radio pumping is suppressed near electron gyro-harmonics, whereas electron temperature enhancement weakens as measured by EISCAT/UHF radar. The main features of these new narrowband EISCAT observations are generally consistent with previous SBS measurements at HAARP.