Radiation belt “dropouts” and drift-bounce resonances in broadband electromagnetic waves

TitleRadiation belt “dropouts” and drift-bounce resonances in broadband electromagnetic waves
Publication TypeJournal Article
Year of Publication2018
AuthorsChaston, CC, Bonnell, JW, Wygant, JR, Reeves, GD, Baker, DN, Melrose, DB
JournalGeophysical Research Letters
Date Published02/2018
KeywordsAlfven waves; Geomagnetic storms; Radial Transport; Radiation belts; Van Allen Probes
AbstractObservations during the main phase of geomagnetic storms reveal an anti-correlation between the occurrence of broadband low frequency electromagnetic waves and outer radiation belt electron flux. We show that the drift-bounce motion of electrons in the magnetic field of these waves leads to rapid electron transport. For observed spectral energy densities it is demonstrated that the wave magnetic field can drive radial diffusion via drift-bounce resonance on timescales less than a drift orbit. This process may provide outward transport sufficient to account for electron “dropouts” during storm main phase and more generally modulate the outer radiation belt during geomagnetic storms.
Short TitleGeophys. Res. Lett.

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