Results of investigation of the langmuir and upper-hybrid plasma turbulence evolution by means of stimulated ionospheric emission
Results of investigation of the langmuir and upper-hybrid plasma turbulence evolution by means of stimulated ionospheric emission
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通过受激电离层发射研究朗缪尔和上混合等离子体湍流演化的结果
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
G. Komrakov
中科院分区：
文献类型：
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作者：
E. Sergeev;V. Frolov;G. Boiko;G. Komrakov
介绍了通过测量强射电发射与电离层 F 区等离子体相互作用的不同阶段的受激电离层发射 (SIE) 特征获得的高频等离子体湍流随时间演化的研究结果。研究发现，在严格参数不稳定（激发朗缪尔等离子体湍流）的条件下，随着泵浦持续时间和泵浦功率的增加，弛豫时间在t≤2.00 ms期间减少了2-4倍。在电离层等离子体长期准连续加热的热参数不稳定（上混合等离子体湍流的激发）条件下，也观察到 SIE 弛豫时间的类似减少。讨论了等离子体湍流能量无碰撞耗散的可能机制，以解释观察到的等离子体波阻尼率对等离子体湍流发展的温度阶段和强度的依赖性。
The results of investigations of the temporal evolution of high-frequency plasma turbulence obtained by measurements of stimulated ionospheric emission (SIE) features for different stages of interaction of powerful radio emission, with an ionospheric F region plasma are presented. It is found that the relaxation time decreased up to 2–4 times with increase in the pump duration and pumping power under the conditions of striction parametric instability (excitation of Langmuir plasma turbulence) over times t≤2.00 ms. A similar decrease of the SIE relaxation time was also observed under the conditions of thermal parametric instability (excitation of upper-hybrid plasma turbulence) in long-term quasicontinuous heating of ionospheric plasma. The possible mechanisms of collisionless dissipation of plasma turbulence energy are discussed to explain the observed dependence of the plasma wave damping rate on the temperal stage of development and intensity of plasma turbulence.