The local generation of high‐frequency plasmaspheric hiss has recently been reported by a case study (He et al., 2019, https://doi.org/10.1029/2018GL081578). In this research, we perform statistics of global distributions of the locally generated high‐frequency plasmaspheric hiss (LHFPH) for different levels of substorm activity, using 6‐year observational data from Van Allen Probes. The statistics find that the LHFPH amplitude presents a strong magnetic local time (MLT) asymmetry and highly depends on substorm activity, and intense LHFPHs occur from predawn to dusk side and can penetrate into inner plasmasphere of L ∼ 3 during AE > 300 nT. The statistical LHFPH spectrum shows that its frequency increases with the ambient magnetic field, with peaked wave powers between 0.1 and 0.5 f_ce. Based on the statistical properties of LHFPH, we evaluate the electron diffusion coefficients using quasi‐linear theory. Those results suggest that electron pitch angle scattering driven by LHFPH could be a potential mechanism for the precipitation loss of suprathermal electrons of 0.1 keV to tens of keV, which can impact the ionization and chemical changes in the upper atmosphere.

中文翻译：

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局部产生的高频等离子体的嘶嘶声及其对超热电子的影响的统计研究：Van Allen探针观测和准线性模拟

案例研究报告了高频等离子体球嘶嘶声的局部产生（He et al。，2019，https://doi.org/10.1029/2018GL081578）。在这项研究中，我们使用Van Allen Probes的6年观测数据，对不同水平的亚暴活动进行了局部产生的高频等离子体球嘶嘶声（LHFPH）的全球分布统计。统计发现，LHFPH振幅呈现强磁场的本地时间（MLT）不对称性和高度依赖于亚暴活性，并激烈LHFPHs从黎明前发生到黄昏侧并能渗透到内等离子层大号 〜3中阿é  > 300 nT。统计的LHFPH频谱显示其频率随环境磁场而增加，峰值波功率在0.1至0.5 f _{c e之间}。基于LHFPH的统计特性，我们使用准线性理论评估电子扩散系数。这些结果表明，由LHFPH驱动的电子俯仰角散射可能是0.1 keV至数十keV的超热电子沉淀损失的潜在机制，这可能会影响高层大气的电离和化学变化。