Electron Diffusion and Advection During Nonlinear Interactions With Whistler‐Mode Waves

Allanson, Oliver; Watt, Clare E. J.; Allison, Hayley; Ratcliffe, Heather

doi:10.1029/2020ja028793

Cited by 29 publications

(39 citation statements)

References 105 publications

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“…This time-scale is close to the observed timescales of electron flux dynamics in the Earth's radiation belts during quiet time periods characterized by not-tohigh wave intensity [e.g., [71][72][73]. However, during more disturbed periods with a high occurrence rate of intense wave packets [10], the observed electron flux evolution could be faster than the evolution predicted by a diffusion model (see discussions in, e.g., [14,36,74]). Our scaling laws of D N L /D QL allow for a simple renormalization of the quasi-linear diffusion rates based on the observed occurrence rate of intense waves resonantly interacting with electrons in the nonlinear regime.…”

Section: Discussionsupporting

confidence: 79%

On a transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

Artemyev,

Neishtadt,

Vasiliev

et al. 2021

Preprint

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Resonances with electromagnetic whistler-mode waves are the primary driver for the formation and dynamics of energetic electron fluxes in various space plasma systems, including shock waves and planetary radiation belts. The basic and most elaborated theoretical framework for the description of the integral effect of multiple resonant interactions is the quasi-linear theory, that operates through electron diffusion in velocity space. The quasi-linear diffusion rate scales linearly with the wave intensity, DQL ∼ B 2 w , which should be small enough to satisfy the applicability criteria of this theory. Spacecraft measurements, however, often detect whistle-mode waves sufficiently intense to resonate with electrons nonlinearly. Such nonlinear resonant interactions imply effects of phase trapping and phase bunching, which may quickly change the electron fluxes in a non-diffusive manner. Both regimes of electron resonant interactions (diffusive and nonlinear) are well studied, but there is no theory quantifying the transition between these two regimes. In this paper we describe the integral effect of nonlinear electron interactions with whistler-mode waves in terms of the time-scale of electron distribution relaxation, ∼ 1/DNL. We determine the scaling of DNL with wave intensity B 2 w and other main wave characteristics, such as wave-packet size. The comparison of DQL and DNL provides the range of wave intensity and wave-packet sizes where the electron distribution evolves at the same rates for the diffusive and nonlinear resonant regimes. The obtained results are discussed in the context of energetic electron dynamics in the Earth's radiation belt.

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Section: Discussionsupporting

confidence: 79%

On a transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

Artemyev,

Neishtadt,

Vasiliev

et al. 2021

Preprint

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show abstract

“…However, during more disturbed periods with a high occurrence rate of intense wave packets [10], the observed electron flux evolution could be faster than the evolution predicted by a diffusion model (see discussions in, e.g., Refs. [14,36,86]). Our scaling laws of D NL /D QL allow for a simple renormalization of the quasilinear diffusion rates based on the observed occurrence rate of intense waves resonantly interacting with electrons in the nonlinear regime.…”

Section: Discussionmentioning

confidence: 99%

Transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

et al. 2021

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…As the calculated whistler-mode linear growth rates in this range are sufficiently high, we believe these waves are locally generated in the plasmasphere. Besides, nonlinear interactions between electrons with tens of keV and whistler-mode waves on a time scale of minute or less (Allanson et al, 2020(Allanson et al, , 2021Gan et al, 2020;Omura, 2021;Vainchtein et al, 2018) could play an important role, which is out the scope of this study and requires further analysis.…”

Section: Discussionmentioning

confidence: 99%

Frequency‐Dependent Responses of Plasmaspheric Hiss to the Impact of an Interplanetary Shock

Yue

et al. 2021

Geophysical Research Letters

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Plasmaspheric hiss waves are structureless broadband whistler-mode emissions with frequencies from tens of Hz to several kHz observed in the plasmasphere and plasmaspheric plumes (Li et al., 2015;Nakamura et al., 2018;Thorne et al., 1973). Hiss waves can resonate with radiation belt electrons and cause pitch angle scattering and loss of relativistic electrons to form the slot region between the inner and outer radiation belt

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Electron Diffusion and Advection During Nonlinear Interactions With Whistler‐Mode Waves

Abstract: Whistler-mode waves play an important role in the dynamics of electrons in energy and pitch-angle space in the Earth's inner magnetosphere (e.g.

Cited by 29 publications

References 105 publications

On a transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

On a transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

Transitional regime of electron resonant interaction with whistler-mode waves in inhomogeneous space plasma

Frequency‐Dependent Responses of Plasmaspheric Hiss to the Impact of an Interplanetary Shock

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