Spectra of Stimulated Electromagnetic Emission of the Ionosphere Upon Sweeping of the Pump Wave Frequency Near Gyroharmonics. I. Experimental Results
Spectra of Stimulated Electromagnetic Emission of the Ionosphere Upon Sweeping of the Pump Wave Frequency Near Gyroharmonics. I. Experimental Results
复制标题
扫描陀螺谐波附近的泵浦波频率时电离层受激电磁发射的频谱。
DOI：
10.1007/s11141-008-9043-5
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发表时间：
2008
影响因子：
0.8
通讯作者：
S. Grach
中科院分区：
文献类型：
--
作者：
P. V. Kotov;E. Sergeev;S. Grach
本文给出了在电子回旋频率nFce的四次(n = 4)和五次(n = 5)次谐波附近的泵浦波扫频时，强无线电波在电离层激发的受激电磁辐射光谱的实验研究结果。对垂直和倾斜方向(天顶以南14°和18°)的长(连续)泵浦以及远离回转谐波的脉冲诊断波进行了扫频。分析了受激电磁辐射的光谱特性与泵浦频率f0(或诊断波频率fdw)与NFCE的比值的关系。结果表明，在多个回旋共振附近，不同的泵浦频率在相同的频率下猝灭了不同光谱特征的受激辐射。当泵浦波束从垂直方向倾斜到足够大时，f_0 ≲ _nFce的受激电磁辐射强度比f_0 >； _nfce显著降低。
We present the results of experimental studies of the spectra of the stimulated electromagnetic emission excited in the ionosphere by powerful radio waves during the pump wave frequency sweeping near the forth (n = 4) and fifth (n = 5) harmonics of the electron cyclotron frequency nfce. The frequency sweep was carried out for long (continuous) pumping in vertical and inclined directions (at 14° and 18° south of the zenith), as well as for the pulse diagnostic wave both with and without additional pumping far from the gyroharmonics. The dependences of the spectral features of the stimulated electromagnetic emission on the ratio between the pump-wave frequency f0 (or on the diagnostic-wave frequency fDW) and nfce were analyzed. It is found that near the multiple gyroresonance, different spectral features of the stimulated emission are quenched at the same frequency for different pump-wave frequencies. For a sufficiently large inclination of the pump wave beam from the vertical direction, the intensity of the stimulated electromagnetic emission is notably decreased for f0 ≲ nfce as compared with f0 > nfce.