资源环境科技发展态势分析平台

In this study we present Van Allen Probe observations showing that seed (hundreds of keV) and core ≥1 MeV) electrons can resonate with ULF wave modes with distinctive m values simultaneously. An unusual electron energy spectrogram with double‐banded resonant structure was recorded by ECT‐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.