A census of plasma waves and structures associated with an injection front in the inner magnetosphere

TitleA census of plasma waves and structures associated with an injection front in the inner magnetosphere
Publication TypeJournal Article
Year of Publication2018
AuthorsMalaspina, DM, Ukhorskiy, A, Chu, X, Wygant, J
JournalJournal of Geophysical Research: Space Physics
Date Published02/2018
KeywordsElectron Injection; inner magnetosphere; Kinetic structures; Plasma Boundaries; plasma waves; Radiation belts; Van Allen Probes
AbstractNow that observations have conclusively established that the inner magnetosphere is abundantly populated with kinetic electric field structures and nonlinear waves, attention has turned to quantifying the ability of these structures and waves to scatter and accelerate inner magnetospheric plasma populations. A necessary step in that quantification is determining the distribution of observed structure and wave properties (e.g. occurrence rates, amplitudes, spatial scales). Kinetic structures and nonlinear waves have broadband signatures in frequency space and consequently, high resolution time domain electric and magnetic field data is required to uniquely identify such structures and waves as well as determine their properties. However, most high resolution fields data is collected with a strong bias toward high amplitude signals in a pre-selected frequency range, strongly biasing observations of structure and wave properties. In this study, a ∼45 minute unbroken interval of 16,384 samples/s fields burst data, encompassing an electron injection event, is examined. This data set enables an unbiased census of the kinetic structures and nonlinear waves driven by this electron injection, as well as determination of their ‘typical’ properties. It is found that the properties determined using this unbiased burst data are considerably different than those inferred from amplitude-biased burst data, with significant implications for wave-particle interactions due to kinetic structures and nonlinear waves in the inner magnetosphere.
URLhttp://onlinelibrary.wiley.com/doi/10.1002/2017JA025005/full
DOI10.1002/2017JA025005
Short TitleJ. Geophys. Res. Space Physics


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