Advanced Numerical Tools for Studying Waves and Instabilities in Kappa Distributed Plasmas

Lopez, Rigoberto; Moya, P. S.; Shaaban, S. M.; Lazar, M.; Yoon, Peter H.; Poedts, Stefaan

doi:10.1007/978-3-030-82623-9_9

Cited by 2 publications

(2 citation statements)

References 60 publications

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“…For case 2, both the proton-cyclotron and mirror modes have comparable growth rates, while for case 3, the mirror mode is the dominant mode. This will be shown by plotting the growth rates for all three cases, but before doing so, we first wish to establish the validity of the approximate analytical approach by making a comparison against the exact numerical solutions, which are obtained via the full bi-Kappa dispersion relation solver DIS-K (López et al 2021b(López et al , 2021a. Figure 2 thus plots the growth rates for the proton-cyclotron and mirror-mode instabilities for all three cases.…”

Section: Numerical Analysis Of Bi-kappa Proton Mirror and Cyclotron I...mentioning

confidence: 99%

Bi-Kappa Proton Mirror and Cyclotron Instabilities in the Solar Wind

Yoon

Lopez

Zaheer

2023

ApJ

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The charged particles in the solar wind are often observed to possess a nonthermal tail in the velocity distribution function, a feature that can be fitted with the Kappa model. The anisotropic, or bi-Kappa, model of protons, electrons, and other charged particles is thus adopted in the literature for interpreting the data as well as in the context of the analysis of wave–particle interactions. The present paper develops an approximate but efficient theory of the mirror and cyclotron instabilities excited by the bi-Kappa protons in the solar wind. A velocity moment-based quasi-linear theory of these instabilities is also formulated in order to investigate the saturation behavior. Applications of the formalism are made for instabilities close to the marginally unstable state, which is typical of the solar wind near 1 au.

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Section: Numerical Analysis Of Bi-kappa Proton Mirror and Cyclotron I...mentioning

confidence: 99%

Bi-Kappa Proton Mirror and Cyclotron Instabilities in the Solar Wind

Yoon

Lopez

Zaheer

2023

ApJ

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“…They showed the key role of suprathermal electrons modeled with the kappa distribution in comparison with the Maxwellian distribution for solar wind conditions. Furthermore, López et al (2019) found that the bi-kappa suprathermal electrons are more unstable to the firehose mode excitation when comparing them with the bi-Maxwellian case, which is shown in linear analysis and particle simulations (see also similar examples of comparison for general oblique instabilities in López et al 2021aLópez et al , 2021b. These analyses have also extended to nonlinear phenomena such as spontaneous electromagnetic fluctuations at ion and electron scales (Viñas et al 2015;Valdivia et al 2016;Lazar et al 2018a;Kim et al 2018;Espinoza et al 2022), focusing on the similarities and differences of the spontaneous emissions between thermal (Maxwellian) and nonthermal plasmas.…”

Section: Introductionmentioning

confidence: 69%

Magnetic Spectra Comparison for Kappa-distributed Whistler Electron Fluctuations

H. P.,

Moya,

Zenteno-Quinteros

et al. 2024

ApJ

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In the inner heliosphere, space measurements have revealed that plasma is well described by the kappa distributions, which are characterized by the value of the κ parameter. This parameter indicates how far plasma is from the ideal Maxwell–Boltzmann equilibrium distribution and gives the distribution a typical high-energy power-law tail. In these quasi-equilibrium conditions, the plasma spontaneously emits electromagnetic fluctuations. When suprathermal electrons are involved, these spontaneous emissions get enhanced, and the kappa distributions improve the description of the related nonthermal effects by taking into account the contribution of these high-energy electrons. Nevertheless, the kappa distributions describe different scenarios in which the velocity distribution may obey a power-law decay. Here, we present a systematic and quantitative comparison of kappa-distributed magnetized plasma through a comparison of magnetic spectra for electron cyclotron whistler mode fluctuations. Our results show that for a kappa distribution with a thermal speed equal to the one obtained in thermal equilibrium, the magnetic field fluctuations exhibit higher energy levels that scale with increasing values of β and decreasing values of κ, even though the same thermal speed is considered for all studied cases. Conversely, for a kappa distribution with a kappa-dependent thermal speed, the magnetic field fluctuations tend to exhibit less total energy with lower kappa values, even when compared to the Maxwellian distribution equilibrium results in the same range of parameters.

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Advanced Numerical Tools for Studying Waves and Instabilities in Kappa Distributed Plasmas

Cited by 2 publications

References 60 publications

Bi-Kappa Proton Mirror and Cyclotron Instabilities in the Solar Wind

Bi-Kappa Proton Mirror and Cyclotron Instabilities in the Solar Wind

Magnetic Spectra Comparison for Kappa-distributed Whistler Electron Fluctuations

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