Quasilinear analysis of saturation properties of broadband whistler mode waves

Tao, X.; Chen, Lunjin; Liu, Xu; Lu, Quanming; Wang, S.

doi:10.1002/2017gl074881

Cited by 28 publications

(43 citation statements)

References 30 publications

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“…The dependence of the saturated whistler wave amplitude on the initial maximum growth rate is similar to the one established by Tao et al (2017) in the quasi-linear analysis of the classical temperature-anisotropy instability (Sagdeev & Shafranov 1960;Kennel & Petschek Figure 7. Panel (a) presents the saturated whistler wave amplitude versus initial normalized electron heat flux, as found in the first set of simulations performed at βc = 1 and various initial values of uc/vA and qe/q0 (Table 1).…”

Section: Discussionsupporting

confidence: 77%

Nonlinear Evolution of the Whistler Heat Flux Instability

Kuzichev

Vasko

Soto-chavez

et al. 2019

ApJ

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We use the one-dimensional TRISTAN-MP particle-in-cell code to model the nonlinear evolution of the whistler heat flux instability that was proposed by Gary et al. (1999) and Gary & Li (2000) to regulate the electron heat flux in the solar wind and astrophysical plasmas. The simulations are initialized with electron velocity distribution functions typical for the solar wind. We perform a set of simulations at various initial values of the electron heat flux and β e . The simulations show that parallel whistler waves produced by the whistler heat flux instability saturate at amplitudes consistent with the spacecraft measurements. The simulations also reproduce the correlations of the saturated whistler wave amplitude with the electron heat flux and β e revealed in the spacecraft measurements. The major result is that parallel whistler waves produced by the whistler heat flux instability do not significantly suppress the electron heat flux. The presented simulations indicate that coherent parallel whistler waves observed in the solar wind are unlikely to regulate the heat flux of solar wind electrons.

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Section: Discussionsupporting

confidence: 77%

Nonlinear Evolution of the Whistler Heat Flux Instability

Kuzichev

Vasko

Soto-chavez

et al. 2019

ApJ

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“…The dependence of ( B∕B) 2 on max can be roughly written as ( B∕B) 2 ∝ max , where the slope varies between 0.70 and 0.76 ( Figure 6). This value is close to the quasi-linear theory results obtained by Tao et al (2017), who showed that ( B∕B) 2 = 0.17 0.76 max with only hot electrons.…”

Section: The Dependence Of Wave Amplitude On Plasma Parameterssupporting

confidence: 91%

Saturation Properties of Whistler Wave Instability in a Plasma With Two Electron Components

Tao

et al. 2019

JGR Space Physics

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Saturation properties of whistler wave instability driven by electron temperature anisotropy in a plasma with two electron components are investigated using particle‐in‐cell (PIC) simulations. Most of the previous self‐consistent PIC simulations or quasi‐linear theory used a single bi‐Maxwellian distribution of electrons, which might apply to solar wind or magnetosheath. In the inner magnetosphere, however, there is frequently a cold and dense electron component, coexisting with a hot electron component. In this work, we investigate the relation between temperature anisotropy (A) and parallel plasma beta (β‖) at saturation. Our results agree well with the previous conclusion obtained from linear theory in most cases. However, We show that the inverse relation breaks when β‖ is larger than certain value βfalse‖,lim, beyond which A increases with increasing β‖. We also investigated the dependence of the saturation wave intensity on plasma beta and the initial linear growth rate and show that the saturation amplitude can be modeled as a function of the maximum initial linear growth rate even in a plasma with two electron components. Our results might be useful to couple the microscopic wave excitation process with macroscopic global energetic electron dynamics and to understand whistler wave excitation in the inner magnetosphere.

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“…PIC codes are used to investigate the self‐consistent mechanism of wave generation and growth in the radiation belts, such as chorus generation and enhancement (Fu et al, , ; Lu et al, ), whistler instability effects (Fan et al, ; Yoon et al, ) and saturation (Wu et al, ), and magnetosonic wave excitation (Chen et al, ) and propagation (Min et al, ). PIC codes are also used to test the validity of the quasilinear theory (e.g., Camporeale, ; Tao et al, ) and for computing spacecraft charging in the radiation belts (Delzanno et al, ; Lucco Castello et al, ). Hybrid codes in which the dense cold electrons are treated as a fluid while the resonant electrons are treated as super particles (PIC based).…”

Section: New Radiation Belt Modeling Capabilities and The Quantificatmentioning

confidence: 99%

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

et al. 2020

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The past decade transformed our observational understanding of energetic particle processes in near‐Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos National Laboratory‐GEO magnetospheric missions. They were supported by conjugate low‐altitude measurements on spacecraft, balloons, and ground‐based arrays. Together, these significantly improved our ability to determine and quantify the mechanisms that control the buildup and subsequent variability of energetic particle intensities in the inner magnetosphere. The high‐quality data from National Aeronautics and Space Administration's Van Allen Probes are the most comprehensive in situ measurements ever taken in the near‐Earth space radiation environment. These observations, coupled with recent advances in radiation belt theory and modeling, including dramatic increases in computational power, have ushered in a new era, perhaps a “golden era,” in radiation belt research. We have edited a Journal of Geophysical Research: Space Science Special Collection dedicated to Particle Dynamics in the Earth's Radiation Belts in which we gather the most recent scientific findings and understanding of this important region of geospace. This collection includes the results presented at the American Geophysical Union Chapman International Conference in Cascais, Portugal (March 2018) and many other recent and relevant contributions. The present article introduces and review the context, current research, and main questions that motivate modern radiation belt research divided into the following topics: (1) particle acceleration and transport, (2) particle loss, (3) the role of nonlinear processes, (4) new radiation belt modeling capabilities and the quantification of model uncertainties, and (5) laboratory plasma experiments.

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Quasilinear analysis of saturation properties of broadband whistler mode waves

Cited by 28 publications

References 30 publications

Nonlinear Evolution of the Whistler Heat Flux Instability

Nonlinear Evolution of the Whistler Heat Flux Instability

Saturation Properties of Whistler Wave Instability in a Plasma With Two Electron Components

Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions

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