In this study, we present Van Allen Probe observations showing that seed (hundreds of keV) and core ( 1 MeV) electrons can resonate with ultra‐low‐frequency (ULF) wave modes with distinctive m values simultaneously. An unusual electron energy spectrogram with double‐banded resonant structure was recorded by energetic particle, composition, and thermal plasma (ECT)‐magnetic electron ion spectrometer (MagEIS) and, meanwhile, boomerang stripes in pitch angle spectrogram appeared at the lower energy band. A localized drift resonance with m = 10 wave component was responsible for the resonant band peaked at ∼200 keV while a global drift resonance with m = 3 component gave rise to the upper band resonance peaked at ∼1 MeV. Time‐Of‐Flight on boomerang stripes suggested that the localized drift resonance with ∼200 keV electrons was confined within the plasmaspheric plume. Electron flux modulations were reproduced by numerical simulations in good consistency with the observations, supporting the scenario that localized and global drift resonance could coexist in the outer belt electron dynamics simultaneously.

中文翻译：

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局部和整体漂移共振的同时观测

在这项研究中，我们提出了Van Allen Probe观测结果，表明种子（数百keV）和核心（ 1 MeV）电子可以同时与具有独特m值的超低频（ULF）波模式产生共振。高能粒子，成分和热等离子体（ECT）磁电子离子谱仪（MagEIS）记录了一个具有双带共振结构的不寻常的电子能量谱图，同时，俯仰角谱图中的回旋镖条纹出现在较低的能带上。本地化漂移共振米 = 10波分量负责该共振带峰值在〜 200千电子伏，而全局漂移共振米 = 3成分引起了上频带谐振峰值在约1 MeV。飞旋镖条纹上的飞行时间表明，约200 keV电子的局域漂移共振被限制在等离子层羽流内。电子通量调制通过数值模拟与观测值很好地重现，支持局部和整体漂移共振可以同时存在于外带电子动力学中的情况。