Statistical and case studies of radio emissions observed near 2ƒce and 3ƒce in the auroral zone
Statistical and case studies of radio emissions observed near 2ƒce and 3ƒce in the auroral zone
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极光区 2°ce 和 3°ce 附近观测到的无线电发射的统计和案例研究
DOI：
10.1029/94ja03147
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发表时间：
1995
影响因子：
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通讯作者：
C. Deehr
中科院分区：
文献类型：
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作者：
A. Weatherwax;J. Labelle;M. L. Trimpi;R. Treumann;J. Minow;C. Deehr
位于阿拉斯加Two Rivers（64.9°N，146.9°W）和阿拉斯加Circle Hot Springs（65.5°N，144.7°W）的接收器已被用于长时间监测0.05-4.8 MHz之间的频谱。极光咆哮是一种接近电离层电子回旋频率（E回旋频率）2倍和3倍的微弱窄带射电辐射，它的季节效应和日效应已被确定。许多个别的极光咆哮事件与磁活动相关，叠加的历元分析使用行星K指数显示磁活动和极光咆哮开始之间的相关性。对于1992年3月23日发生的3000年极光咆哮事件，riometer，磁强计，光度计和全天空相机数据可用，并显示3000年极光咆哮的个体爆发与极光的增强有关，就像以前所知道的2000年极光咆哮一样。最后，详细研究了两种可能的产生机制：低杂波与静电上杂波之间的非线性相互作用产生电磁波，以及利用低电离层色散脉塞直接产生高次谐波X模电磁波的可行性。
Receivers located at Two Rivers, Alaska (64.9°N, 146.9°W), and Circle Hot Springs, Alaska (65.5°N, 144.7°W), have been used to monitor the spectrum between 0.05-4.8 MHz for extended periods. Seasonal and diurnal effects of auroral roar, a weak narrow band radio emission near 2 and 3 times the ionospheric electron cyclotron frequency (ƒce), have been determined. Many individual auroral roar events correlate with magnetic activity, and superposed epoch analysis using planetary K indices shows a correlation between magnetic activity and auroral roar commencement. For a 3ƒce roar event on March 23, 1992, riometer, magnetometer, photometer, and all-sky camera data are available and show that individual bursts of 3ƒce auroral roar are associated with intensifications of the aurora, as was known previously for 2ƒce roar. Finally, two possible generation mechanisms are investigated in detail: nonlinear interaction between lower hybrid and electrostatic upper hybrid waves producing electromagnetic waves, and the feasibility of a lower ionospheric decameter maser for direct generation of X mode waves at harmonics of ƒce.
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