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Data-Driven Simulation of Rapid Flux Enhancement of Energetic Electrons With an Upper-Band Whistler Burst.

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Title: Data-Driven Simulation of Rapid Flux Enhancement of Energetic Electrons With an Upper-Band Whistler Burst.
Authors: Saito, S.1 s.saito@nict.go.jp, Kurita, S.2, Miyoshi, Y.3, Kasahara, S.4, Yokota, S.5, Keika, K.4, Hori, T.3, Kasahara, Y.6, Matsuda, S.7, Shoji, M.3, Nakamura, S.3, Matsuoka, A.8, Imajo, S.3, Shinohara, I.7
Source: Journal of Geophysical Research. Space Physics. Apr2021, Vol. 126 Issue 4, p1-15. 15p.
Subject Terms: Atmospheric electron precipitation, Atmospheric physics, Cyclotrons, Particle accelerators, Resonance accelerators
Abstract: The temporal variation of the energetic electron flux distribution caused by whistler mode chorus waves through the cyclotron resonant interaction provides crucial information on how electrons are accelerated in the Earth's inner magnetosphere. This study employs a data-driven test-particle simulation which demonstrates that the rapid change of energetic electron distribution observed by the Arase satellite cannot be simply explained by a quasi-linear diffusion mechanism, but is essentially caused by nonlinear scattering: the phase trapping and the phase dislocation. In response to upper-band whistler chorus bursts, multiple nonlinear interactions finally achieve an efficient flux enhancement of electrons on a time scale of the chorus burst. A quasi-linear diffusion model tends to underestimate the flux enhancement of energetic electrons as compared with a model based on the realistic dynamic frequency spectrum of whistler waves. It is concluded that the nonlinear phase trapping plays an important role in the rapid flux enhancement of energetic electrons observed by Arase. [ABSTRACT FROM AUTHOR]
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Abstract:The temporal variation of the energetic electron flux distribution caused by whistler mode chorus waves through the cyclotron resonant interaction provides crucial information on how electrons are accelerated in the Earth's inner magnetosphere. This study employs a data-driven test-particle simulation which demonstrates that the rapid change of energetic electron distribution observed by the Arase satellite cannot be simply explained by a quasi-linear diffusion mechanism, but is essentially caused by nonlinear scattering: the phase trapping and the phase dislocation. In response to upper-band whistler chorus bursts, multiple nonlinear interactions finally achieve an efficient flux enhancement of electrons on a time scale of the chorus burst. A quasi-linear diffusion model tends to underestimate the flux enhancement of energetic electrons as compared with a model based on the realistic dynamic frequency spectrum of whistler waves. It is concluded that the nonlinear phase trapping plays an important role in the rapid flux enhancement of energetic electrons observed by Arase. [ABSTRACT FROM AUTHOR]
ISSN:21699380
DOI:10.1029/2020JA028979