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Properties of intense fieldaligned lowerband chorus waves: Implications for nonlinear waveparticle interactions
Author  Zhang, X.J.; Thorne, R.; Artemyev, A.; Mourenas, D.; Angelopoulos, V.; Bortnik, J.; Kletzing, C.; Kurth, W.; Hospodarsky, G.; 
Keywords  chorus waves; Effective amplitude; nonlinear waveparticle interaction; spatial distribution; statistics; Van Allen Probes; Wavepacket length 
Abstract  Resonant interactions between electrons and chorus waves are responsible for a wide range of phenomena in nearEarth space (e.g., diffuse aurora, acceleration of MeV electrons, etc.). Although quasilinear diffusion is believed to be the primary paradigm for describing such interactions, an increasing number of investigations suggest that nonlinear effects are also important in controlling the rapid dynamics of electrons. However, present models of nonlinear waveparticle interactions, which have been successfully used to describe individual shortterm events, are not directly applicable for a statistical evaluation of nonlinear effects and the longterm dynamics of the outer radiation belt, because they lack information on the properties of intense (nonlinearly resonating with electrons) chorus waves. In this paper, we use the THEMIS and Van Allen Probes datasets of fieldaligned chorus waveforms to study two key characteristics of these waves: effective amplitude w (nonlinear interaction can occur when w > 2) and wavepacket length β (the number of wave periods within it). While as many as 10  15\% of chorus wavepackets are sufficiently intense (w > 2  3) to interact nonlinearly with relativistic electrons, most of them are short (β < 10) reducing the efficacy of such interactions. Revised models of nonlinear interactions are thus needed to account for the longterm effects of these common, intense but short chorus wave packets. We also discuss the dependence of w, β on location (MLT, Lshell) and on the properties of the suprathermal electron population. 
Year of Publication  2018 
Journal  Journal of Geophysical Research: Space Physics 
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Date Published  06/2018 
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URL  https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JA025390 
DOI  10.1029/2018JA025390 