Van Allen Probes Observations of Structured Whistler-mode Activity and Coincident Electron Landau Acceleration Inside a Remnant Plasmaspheric Plume

TitleVan Allen Probes Observations of Structured Whistler-mode Activity and Coincident Electron Landau Acceleration Inside a Remnant Plasmaspheric Plume
Publication TypeJournal Article
Year of Publication2017
AuthorsWoodroffe, JR, Jordanova, VK, Funsten, HO, Streltsov, AV, Bengtson, MT, Kletzing, CA, Wygant, JR, Thaller, SA, Breneman, AW
JournalJournal of Geophysical Research: Space Physics
Volume122
Issue1
Date Published02/2017
KeywordsDucting; Van Allen Probes; wave-particle interactions; Whistlers
AbstractWe present observations from the Van Allen Probes spacecraft that identify an region of intense whistler-mode activity within a large density enhancement outside of the plasmasphere. We speculate that this density enhancement is part of a remnant plasmaspheric plume, with the observed wave being driven by a weakly anisotropic electron injection that drifted into the plume and became non-linearly unstable to whistler emission. Particle measurements indicate that a significant fraction of thermal (<100 eV) electrons within the plume were subject to Landau acceleration by these waves, an effect that is naturally explained by whistler emission within a gradient and high-density ducting inside a density enhancement.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2015JA022219/full
DOI10.1002/2015JA022219


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