SM038-04
Origin of Electron Boomerang Stripes: Localized ULF Wave-particle Interactions

Monday, 14 December 2020: 20:42
Virtual
Xingxin Zhao1, Yixin Hao2, Qiugang Zong2, Xuzhi Zhou2, Chao Yue3, Xingran Chen2, Ying Liu2, J Bernard Blake4, Seth G Claudepierre5 and Geoffrey D Reeves6, (1)ITAG Institute of Theoretical and Applied Geophysics, Peking University, Beijing, China, Beijing, China, (2)Peking University, School of Earth and Space Sciences, Beijing, China, (3)Peking University, Beijing, China, (4)The Aerospace Corporation, Los Angeles, CA, United States, (5)The Aerospace Corporation, Santa Monica, CA, United States, (6)Los Alamos National Laboratory, Los Alamos, NM, United States
Recorded Presentation
Abstract:
Ultralow frequency (ULF) wave‐particle interactions play a significant role in the radiation belt dynamic process, during which drift resonance can accelerate and transport energetic electrons in the outer radiation belt. Observations of wave‐electron drift resonance are characterized by quasiperiodic straight or “boomerang‐shaped” stripes in the pitch angle spectrogram. Here we present an ULF wave event on 1 December 2015, during which both kinds stripes were observed by Van Allen Probes A and B, respectively. Using the time‐of‐flight technique based on the pitch angle dependence of electron drift velocities, the “boomerang‐shaped” stripes are inferred to originate from straight stripes at the time and location covered by Probe B. Given that straight stripes were indeed observed by Probe B, our observations strongly support the charged particle interacting with azimuthally localized ULF waves. A new method is provided to identify the location of ULF wave‐particle interaction on the basis of remote observations of electron flux modulations.
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