coherent generation of VLF hiss
coherent generation of VLF hiss
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VLF 嘶嘶声的相干产生
DOI：
10.1029/ja081i010p01707
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发表时间：
1976
影响因子：
--
通讯作者：
J. Maggs
中科院分区：
文献类型：
--
作者：
J. Maggs
提出极低频啸声是由于极光电子束对非相干切伦科夫哨声辐射的对流放大而产生的。利用最低阶WKB波动力学方程和线性增长率研究了光束放大机制。结果表明，非相干切伦科夫辐射不能产生强烈的VLF嘶嘶声没有光束放大和光束放大机制可以解释所观察到的带宽和功率通量的强VLF嘶嘶声时，电子回旋频率小于电子等离子体频率。当电子等离子体频率小于电子回旋频率时，该理论不适用于高频率，因为非线性过程对等离子体频率附近的频率很重要。（AIP）
VLF hiss is proposed to result from convective beam amplification of incoherent Cerenkov whistler radiation by the beam of precipitating auroral electrons. The beam amplification mechanism is investigated by using the lowest-order WKB wave kinetic equation and linear growth rates. It is shown that incoherent Cerenkov radiation cannot produce strong VLF hiss without beam amplification and that the beam amplification mechanism can account for the observed bandwidth and power fluxes of strong VLF hiss when the electron gyrofrequency is less than the electron plasma frequency. The theory is not adequate for high frequencies when the electron plasma frequency is less than the electron gyrofrequency, because nonlinear processes are important for frequencies near the plasma frequency. (AIP)