Marginal Plasma Waves in the Equatorial Electrojet Observed By HF Coherent Radar Techniques
Marginal Plasma Waves in the Equatorial Electrojet Observed By HF Coherent Radar Techniques
复制标题
高频相干雷达技术观测赤道电射流中的边缘等离子体波
DOI：
--
复制
发表时间：
1979
期刊：
影响因子：
--
通讯作者：
M. Crochet
中科院分区：
文献类型：
--
作者：
C. Hanuise;M. Crochet
赤道电喷射中的多频率观测表明，直到频率低至 4.6 MHz 为止，都可以检测到 1 型不规则现象。它们的相速度等于受E层初级梯度影响的阈值。白天，梯度不稳定，阈值速度小于离子声速。然后，对于较低的漂移速度，会出现 1 型不规则现象，并且必须根据这些测量结果重新审视赤道电射流中等离子体不稳定性的理论。
Multifrequency observations in the equatorial electrojet have shown that type 1 irregularities can be detected until frequencies as low as 4.6 MHz. Their phase velocity is equal to a threshold value which is influenced by the primary gradient in the E layer. During daytime the gradient is destabilizing and the threshold velocity is less than the ion acoustic velocity. Type 1 irregularities are then present for lower drift velocities and theories of plasma instabilities in the equatorial electrojet have to be reexamined at the light of these measurements.