New electron gyroharmonic effects in HF scatter from pump‐excited magnetic field‐aligned ionospheric irregularities
New electron gyroharmonic effects in HF scatter from pump‐excited magnetic field‐aligned ionospheric irregularities
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泵激磁场对齐电离层不规则性产生的高频散射中新的电子陀螺谐波效应
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
B. Thidé
中科院分区：
文献类型：
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作者：
P. Ponomarenko;T. Leyser;B. Thidé
本文报道了俄罗斯苏拉无线电装置对电离层F区电磁高频抽运激发的小尺度地磁场等离子体不规则体共振高频散射的实验结果。这些结果包括第一次观察到的最小值的散射信号强度时，泵浦频率是附近的第四电子gyroharmonic和一个显着扩大的频谱的散射信号的泵浦频率以上的gyroharmonic。抽气后，宽光谱的侧面迅速衰减。这些新的观察链接在一起的现象归因于小规模的场对准的不规则性的激发，因此被认为是显着的贡献，我们的理解下的空间等离子体的自组织的外部扰动的作用的几个以前的实验结果的回旋谐波效应。
Experimental results of resonant high-frequency (HF) scattering from small-scale geomagnetic field-aligned plasma irregularities excited by electromagnetic HF pumping of the ionospheric F region from the Sura radio facility in Russia are reported. These results include the first observations of a minimum in the scattered signal intensity when the pump frequency was near the fourth electron gyroharmonic and of a significant broadening of the frequency spectrum of the scattered signal for pump frequencies above the gyroharmonic. After pump-off, the flanks of the broad spectrum decayed rapidly. These new observations link together several previous experimental results of gyroharmonic effects in phenomena attributed to the excitation of small-scale field-aligned irregularities and are therefore thought to be significant contributions to our understanding of the self-organization of the space plasma under the action of an external perturbation.