Generation process of large-amplitude upper-band chorus emissions observed by Van Allen Probes
Generation process of large-amplitude upper-band chorus emissions observed by Van Allen Probes
复制标题
范艾伦探针观测到的大振幅上频带合唱发射的产生过程
DOI：
10.1029/2017ja024782
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
G.
中科院分区：
文献类型：
--
作者：
Kubota;Y.;Omura;Y.;Kletzing;C.;& Reeves;G.
我们分析了范艾伦探测器上的电磁场仪器套件和综合科学仪器包在磁赤道附近测量的大振幅上频带合唱发射。根据理论分析和氦氧质子电子仪器的观测结果，建立了激发发射的源电子参数，并利用非线性波生长理论计算了阈值和最佳振幅。我们发现最佳振幅大于在合唱发射的频率范围内获得的阈值振幅，并且波振幅在阈值和最佳振幅之间增长。在波生长过程的框架中，非线性增长率远大于线性增长率。
We analyze large‐amplitude upper‐band chorus emissions measured near the magnetic equator by the Electric and Magnetic Field Instrument Suite and Integrated Science instrument package on board the Van Allen Probes. In setting up the parameters of source electrons exciting the emissions based on theoretical analyses and observational results measured by the Helium Oxygen Proton Electron instrument, we calculate threshold and optimum amplitudes with the nonlinear wave growth theory. We find that the optimum amplitude is larger than the threshold amplitude obtained in the frequency range of the chorus emissions and that the wave amplitudes grow between the threshold and optimum amplitudes. In the frame of the wave growth process, the nonlinear growth rates are much greater than the linear growth rates.