%AArtemyev, A. [Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA]%AMourenas, D. [CEA DAM DIF Arpajon France, Laboratoire Matière en Conditions Extrêmes Paris‐Saclay University CEA Bruyères‐le‐Châtel France]%AZhang, X. [Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA]%AVainchtein, D. [Nyheim Plasma Institute Drexel University Camden NJ USA]%BJournal Name: Journal of Geophysical Research: Space Physics; Journal Volume: 127; Journal Issue: 9; Related Information: CHORUS Timestamp: 2023-08-21 12:52:07 %D2022%IDOI PREFIX: 10.1029 %JJournal Name: Journal of Geophysical Research: Space Physics; Journal Volume: 127; Journal Issue: 9; Related Information: CHORUS Timestamp: 2023-08-21 12:52:07 %K %MOSTI ID: 10373412 %PMedium: X %TOn the Incorporation of Nonlinear Resonant Wave‐Particle Interactions Into Radiation Belt Models %XAbstract

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.

%0Journal Article