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On the Incorporation of Nonlinear Resonant Wave‐Particle Interactions Into Radiation Belt Models
Journal article   Open access   Peer reviewed

On the Incorporation of Nonlinear Resonant Wave‐Particle Interactions Into Radiation Belt Models

A. V. Artemyev, D. Mourenas, X.‐J. Zhang and D. Vainchtein
Journal of geophysical research. Space physics, v 127(9), pn/a
Sep 2022
DOI: https://doi.org/10.1029/2022JA030853
url
https://rss.onlinelibrary.wiley.com/doi/am-pdf/10.1029/2022ja030853View
Accepted (AM)Open Access (Publisher-Specific),  Open

Abstract

nonlinear resonances radiation belts wave‐particle resonant interaction whistler‐mode waves
Wave‐particle resonant interaction is a key process controlling energetic electron flux dynamics in the Earth's radiation belts. All existing radiation belt codes are Fokker‐Planck models relying on the quasi‐linear diffusion theory to describe the impact of wave‐particle interactions. However, in the outer radiation belt, spacecraft often detect waves sufficiently intense to interact resonantly with electrons in the nonlinear regime. In this study, we propose an approach for estimating and including the contribution of such nonlinear resonant interactions into diffusion‐based radiation belt models. We consider electron resonances with whistler‐mode wave‐packets responsible for injected plasma sheet (∼100 keV) electron acceleration to relativistic energies and/or for their precipitation into the atmosphere. Using statistics of chorus wave‐packet amplitudes and sizes (number of wave periods within one packet), we provide a rescaling factor for quasi‐linear diffusion rates, that accounts for the contribution of nonlinear interactions in long‐term electron flux dynamics. Such nonlinear effects may speed up 0.1–1 MeV electron diffusive acceleration by a factor of ×1.5–2 during disturbed periods. We discuss further applications of the proposed approach and the importance of nonlinear resonant interactions for long‐term radiation belt dynamics. Key Points We propose an approach to estimate contributions of nonlinear resonant interactions in long‐term electron flux dynamics We provide rescaling factors of diffusion rates accounting for the contribution of nonlinear electron interactions Nonlinear interactions may speed up electron acceleration by a factor of ×1.5–2 during disturbed periods

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Astronomy & Astrophysics
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