Buoyancy Waves in Earth's Nightside Magnetosphere: Normal-Mode Oscillations of Thin Filaments

A theory has been developed for small oscillations of a thin filament in the magnetosphere. For the lowest-frequency even modes, the eigenfunctions are essentially buoyancy waves in the plasma sheet, but they are more like slow modes in the inner magnetosphere. For the lowest-frequency even modes, the eigenfrequencies (radians/s) have peak values of approximately 0.07 s^-1 between the inner plasma sheet and plasmapause, for an average magnetospheric field. This includes software and model data used in this paper. Submitted to JGR for review本研究针对磁层内细丝状体的小振幅振荡建立了一套理论。针对最低频偶宇称模式，其本征函数本质上为等离子体片中的浮力波，但在内磁层中则更接近慢模。在平均磁层磁场条件下，内等离子体片与等离子体层顶之间的最低频偶宇称模式本征频率（单位：弧度/秒）峰值约为0.07 s⁻¹。本数据集包含本文研究中所用的软件与模型数据，已提交至《Journal of Geophysical Research (JGR)》进行审稿。