Thomson Scatter Measurements of Magnetic Field Effects on the Landau Damping and Excitation of Plasma Waves
Thomson Scatter Measurements of Magnetic Field Effects on the Landau Damping and Excitation of Plasma Waves
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等离子波朗道阻尼和激励磁场效应的汤姆森散射测量
DOI：
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发表时间：
1969
期刊：
影响因子：
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通讯作者：
F. Perkins
中科院分区：
文献类型：
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作者：
E. Fremouw;J. Petriceks;F. Perkins
雷达观测来自电离层中等离子波的非热稳态水平的汤姆森散射，用于测试动力学理论关于波的非热水平如何取决于波矢和磁场之间的角度的预测。非热效应是由高能光电子尾对麦克斯韦电子速度分布产生的。从与磁场几乎平行到几乎垂直（其中回旋共振效应起主要作用）的多个角度进行了观察。结果与动力学理论一致。
Radar observations of Thomson scatter from the nonthermal, steady‐state level of plasma waves in the ionosphere are used to test the predictions of kinetic theory with regard to how the nonthermal level of the waves depends on the angle between the wavevector and the magnetic field. Nonthermal effects are produced by a high‐energy, photoelectron tail on the otherwise Maxwellian electron velocity distribution. Observations were made at several angles varying from nearly parallel to nearly perpendicular (where cyclotron resonance effects play a major role) to the magnetic field. The results are in consistent agreement with kinetic theory.