Diagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels

TitleDiagnosis of ULF Wave-Particle Interactions With Megaelectron Volt Electrons: The Importance of Ultrahigh-Resolution Energy Channels
Publication TypeJournal Article
Year of Publication2018
AuthorsHartinger, MD, Claudepierre, SG, Turner, DL, Reeves, GD, Breneman, A, Mann, IR, Peek, T, Chang, E, Blake, JB, Fennell, JF, O'Brien, TP, Looper, MD
JournalGeophysical Research Letters
Date Published10/2018
Keywordsdrift resonance; particle detector; Pc5; Radiation belts; ULF wave; Van Allen Probes; Wave‐particle interaction
AbstractElectron flux measurements are an important diagnostic for interactions between ultralow‐frequency (ULF) waves and relativistic (∼1 MeV) electrons. Since measurements are collected by particle detectors with finite energy channel width, they are affected by a phase mixing process that can obscure these interactions. We demonstrate that ultrahigh‐resolution electron measurements from the Magnetic Electron Ion Spectrometer on the Van Allen Probes mission—obtained using a data product that improves the energy resolution by roughly an order of magnitude—are crucial for understanding ULF wave‐particle interactions. In particular, the ultrahigh‐resolution measurements reveal a range of complex dynamics that cannot be resolved by standard measurements. Furthermore, the standard measurements provide estimates for the ULF flux modulation amplitude, period, and phase that may not be representative of true flux modulations, potentially leading to ambiguous conclusions concerning electron dynamics.
URLhttps://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL080291
DOI10.1029/2018GL080291
Short TitleGeophys. Res. Lett.


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