Nonlinear Wave‐Particle Interaction Effects on Radiation Belt Electron Dynamics in 9 October 2012 Storm

Author:

Kondrashov D.1ORCID,Drozdov A. Y.2ORCID,Shprits Y.23ORCID

Affiliation:

1. Department of Atmospheric and Oceanic Sciences University of California Los Angeles Los Angeles CA USA

2. Department of Earth, Planetary and Space Sciences University of California Los Angeles Los Angeles CA USA

3. GFZ University of Potstam Potsdam Germany

Abstract

AbstractWe study the geomagnetic storm of 9 October 2012, where it had been generally accepted that the resulting prominent outer radiation belt electron acceleration throughout the storm is due to whistler‐mode chorus waves. This storm has been studied previously by two‐dimensional Fokker–Planck numerical simulations with data‐driven quasi‐linear (QL) diffusion rates. However, possible nonlinear (NL) resonant interaction effects on electron flux dynamics haven't been looked at yet. This study aims to fill this gap by demonstrating that theory‐informed rescaling of QL diffusion rates accounting for contributions of NL resonant interactions helps to reproduce better observed increase of electron fluxes by diffusion simulations. We use machine learning, uncertainty quantification (UQ), physics‐perturbed ensemble of VERB simulations and Van Allen Probes observations to identify optimal rescaling of quasi‐linear diffusion rates.

Funder

Division of Atmospheric and Geospace Sciences

Heliophysics Division

Publisher

American Geophysical Union (AGU)

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