On origin of outshifted plasma lines during HF modification experiments
On origin of outshifted plasma lines during HF modification experiments
复制标题
高频改性实验中等离子体线外移的起源
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
Wlodek Kofman
中科院分区：
文献类型：
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作者：
E. Mishin;T. Hagfors;Wlodek Kofman
在向电离层注入强烈的高频辐射期间观察到的外移的激光谱线是由于朗努尔波的散射，其光谱Widi，h移位在注入频率之上。非相干散射雷达观测显示，这些波有时位于超过普通高频波反射层高度几千公分的高度，这使得泰图斯对所谓的“自由模”的解释有问题。我们表明，这些观测可以一致地用Z-Ito(Le)艾里模式中密度耗竭的产生来描述(由于有质动力。加速超热电子对朗缪尔等离子体的TLTE激发导致了这些等离子体谱线特征的宽谱宽和频移。
Outshifted I)lasma lines, observed during injections of intense HF ra(tiowaves into the ioosphere, are due to scattering on Langlnuir waves with an unusually large spectral widi, h shifted above the injected frequency. Incoherent scatter radar observations reveal that these waves sometimes are located at altitudes exceeding by several kilolneters the altitude of the reflection layer of the ordinary HF wave, titus making an explanation in terlns of the so-called "free mode" problematic. We show that these olservations may be consistently described by the creation, (lue to the ponderomotive force, of density depletions in the Airy pattern of the Z ito(le. Tlte geileration of Langmuir plasmons by accelerated suprathermal electrons itside the depletions causes the wide spectral width of these plasma line features and their Inean frequency shift.