Simultaneous Observations of Localized and Global Drift Resonance. Issue 17 (31st August 2020)

• Record Type: Journal Article
• Authors: Hao, Y. X.; Zhao, X. X.; Zong, Q.‐G.; Zhou, X.‐Z.; Rankin, R.; Chen, X. R.; Liu, Y.; Fu, S. Y.; Blake, J. B.; Reeves, G. D.; Claudepierre, S. G.
• Is Part Of: Geophysical research letters. Volume 47:Issue 17(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-08-31
• Subjects: drift resonance -- ULF waves -- radiation belt dynamics -- boomerang stripes -- azimuthal wave number -- multiple resonances; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1029/2020GL088019
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: 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. Key Points: We, for the first time, report the banded drift resonance between outer belt electrons and ULF waves ULF waves with small and moderate azimuthal wave numbers can resonate with core and seed electrons simultaneously Azimuthally localized and global drift resonances are able to coexist