Gyrokinetic particle simulation of nonlinear evolution of mirror instability

Porazik, P.

doi:10.1002/2013ja019308

Cited by 12 publications

(8 citation statements)

References 55 publications

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“…Such a flattening is expected from the quasilinear predictions (Califano et al 2008). The quasilinear approximation is, however, questionable when coherent structures appear; on the other hand, the proton trapping has a similar effect on the velocity distribution function (Porazik & Johnson 2013).…”

Section: Mirror and Ion Cyclotron Instabilitiesmentioning

confidence: 80%

Proton temperature-anisotropy-driven instabilities in weakly collisional plasmas: Hybrid simulations

Hellinger

Trávníček

2014

J. Plasma Phys.

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Kinetic instabilities in weakly collisional, high beta plasmas are investigated using two-dimensional hybrid expanding box simulations with Coulomb collisions modeled through the Langevin equation (corresponding to the Fokker-Planck one). The expansion drives a parallel or perpendicular temperature anisotropy (depending on the orientation of the ambient magnetic field). For the chosen parameters the Coulomb collisions are important with respect to the driver but are not strong enough to keep the system stable with respect to instabilities driven by the proton temperature anisotropy. In the case of the parallel temperature anisotropy the dominant oblique fire hose instability efficiently reduces the anisotropy in a quasilinear manner. In the case of the perpendicular temperature anisotropy the dominant mirror instability generates coherent compressive structures which scatter protons and reduce the temperature anisotropy. For both the cases the instabilities generate temporarily enough wave energy so that the corresponding (anomalous) transport coefficients dominate over the collisional ones and their properties are similar to those in collisionless plasmas.

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Section: Mirror and Ion Cyclotron Instabilitiesmentioning

confidence: 80%

Proton temperature-anisotropy-driven instabilities in weakly collisional plasmas: Hybrid simulations

Hellinger

Trávníček

2014

J. Plasma Phys.

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“…The simulation also showed the transition from magnetic peaks into troughs when the plasma became marginally mirror stable. Later, gyrokinetic approach was used to simulate the nonlinear growth of the mirror mode by Porazik and Johnson (, ). Their simulations show that magnetic troughs saturate at lower amplitude and earlier than the peaks and in turn lead to the development of magnetic peaks.…”

Section: Summary and Discussionmentioning

confidence: 99%

Electron Dynamics in Magnetosheath Mirror‐Mode Structures

et al. 2018

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Mirror‐mode structures are widely observed in space plasma environments. Although plasma features within the structures have been extensively investigated in theoretical models and numerical simulations, relatively few observational studies have been made, due to a lack of high‐cadence measurements of particle distributions in previous space missions. In this work, electron dynamics associated with mirror‐mode structures are studied based on Magnetospheric Multiscale observations of electron pitch angle distributions. We define mirror‐mode peaks/troughs as the region where the magnetic field strength is greater/smaller than the mean field. The observations show that most electrons are trapped inside the mirror‐mode troughs and display a donut‐like pitch angle distribution configuration. Besides the trapped electrons in mirror‐mode troughs, we find that electrons are also trapped between ambient mirror‐mode peaks and coexisting untrapped electrons within the mirror‐mode structure. Analysis shows that the observed donut‐like electron distributions are the result of betatron cooling and the spatial dependence of electron pitch angles within the structure.

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“…For instance, McKean et al (1992McKean et al ( , 1993McKean et al ( , 1994, Gary et al (1993cGary et al ( , 1996a, , Gary and Saito (2003), Shoji et al (2009), Omidi et al (2010, and Bortnik et al (2011) performed mirror and ioncyclotron (or EMIC) instabilities with parameters relevant to the magnetosheath and magnetosphere. Later, however, with applications to the solar wind and other astrophysical situations in mind, further simulations were carried out by Califano et al (2008), Camporeale andBurgess (2008, 2010), Génot et al (2009, Porazik and Johnson (2013b), and Ahmadi et al (2016). Firehose instability driven by excessive parallel temperature anisotropy was also simulated (Gary and Nishimura 2003).…”

Section: Introductionmentioning

confidence: 99%

Kinetic instabilities in the solar wind driven by temperature anisotropies

Yoon

2017

Rev. Mod. Plasma Phys.

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The present paper comprises a review of kinetic instabilities that may be operative in the solar wind, and how they influence the dynamics thereof. The review is limited to collective plasma instabilities driven by the temperature anisotropies. To limit the scope even further, the discussion is restricted to the temperature anisotropy-driven instabilities within the model of bi-Maxwellian plasma velocity distribution function. The effects of multiple particle species or the influence of field-aligned drift will not be included. The field-aligned drift or beam is particularly prominent for the solar wind electrons, and thus ignoring its effect leaves out a vast portion of important physics. Nevertheless, for the sake of limiting the scope, this effect will not be discussed. The exposition is within the context of linear and quasilinear Vlasov kinetic theories. The discussion does not cover either computer simulations or data analyses of observations, in any systematic manner, although references will be made to published works pertaining to these methods. The scientific rationale for the present analysis is that the anisotropic temperatures associated with charged particles are pervasively detected in the solar wind, and it is one of the key contemporary scientific research topics to correctly characterize how such anisotropies are generated, maintained, and regulated in the solar wind. The present article aims to provide an up-to-date theoretical development on this research topic, largely based on the author's own work.

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Gyrokinetic particle simulation of nonlinear evolution of mirror instability

Cited by 12 publications

References 55 publications

Proton temperature-anisotropy-driven instabilities in weakly collisional plasmas: Hybrid simulations

Proton temperature-anisotropy-driven instabilities in weakly collisional plasmas: Hybrid simulations

Electron Dynamics in Magnetosheath Mirror‐Mode Structures

Kinetic instabilities in the solar wind driven by temperature anisotropies

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