The effect of altitude- and velocity-dependent wave–particle interactions on the H+ and O+ outflows in the auroral region

Barghouthi, I. A.; Doudin, Nassar; Saleh, Adli A.; Pierrard, Viviane

doi:10.1016/j.jastp.2008.01.005

Cited by 5 publications

(6 citation statements)

References 28 publications

(60 reference statements)

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“…More recently, Barghouthi et al (2007) analyzed also the effect of finite electromagnetic turbulence wavelength on the highaltitude and high latitude O + and H + outflows. Barghouthi et al (2008) showed that altitude and velocity dependent wave-particle interactions lead to the formation of toroids at high altitude for the ion VDFs.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Recent Progress in Physics-Based Models of the Plasmasphere

et al. 2009

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We describe recent progress in physics-based models of the plasmasphere using the fluid and the kinetic approaches. Global modeling of the dynamics and influence of the plasmasphere is presented. Results from global plasmasphere simulations are used to understand and quantify (i) the electric potential pattern and evolution during geomagnetic storms, and (ii) the influence of the plasmasphere on the excitation of electromagnetic ion cyclotron (EMIC) waves and precipitation of energetic ions in the inner magnetosphere. The interactions of the plasmasphere with the ionosphere and the other regions of the magnetosphere are pointed out. We show the results of simulations for the formation of the plasmapause and discuss the influence of plasmaspheric wind and of ultra low frequency (ULF) waves for transport of plasmaspheric material. Theoretical models used to describe the electric field and plasma distribution in the plasmasphere are presented. Model predictions are compared to recent CLUSTER and IMAGE observations, but also to results of earlier models and satellite observations.

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Section: Monte Carlo Simulationsmentioning

confidence: 99%

Recent Progress in Physics-Based Models of the Plasmasphere

et al. 2009

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“…RCC model: based on the work of Crew and Chang [1985], Chang [1993], Retterer et al [1987a, 1987b, 1994]. For more details about this model, see Barghouthi et al [2008]; they used this model to investigate the behavior of ion outflow at high altitudes in the auroral region.…”

Section: Theoretical Formulationsmentioning

confidence: 99%

“…They found that including the effect of finite electromagnetic turbulence wavelength, i.e., the effect of velocity‐dependent diffusion coefficient and consequently, the velocity‐dependent wave‐particle interaction, produces realistic H + and O + temperatures and H + and O + toroids, and this is qualitatively consistent with the observations of H + and O + ions in the auroral region at high altitudes. (3) Barghouthi et al [2008] discussed H + and O + outflows at high altitude and high latitude by using another combined (altitude part from Barghouthi [1997] and velocity part from Crew and Chang [1985] and Chang [1993]) form for the diffusion coefficient. They discussed the behavior of ion outflow in terms of the peaked nature of the velocity diffusion coefficient; they found that the peaked nature of diffusion coefficient reflects the way in which altitude and velocity dependent wave‐particle interaction lead to formation of H + and O + toroids at high altitudes in the auroral region.…”

Section: Introductionmentioning

confidence: 99%

“…(3) Barghouthi et al [2008] discussed H + and O + outflows at high altitude and high latitude by using another combined (altitude part from Barghouthi [1997] and velocity part from Crew and Chang [1985] and Chang [1993]) form for the diffusion coefficient. They discussed the behavior of ion outflow in terms of the peaked nature of the velocity diffusion coefficient; they found that the peaked nature of diffusion coefficient reflects the way in which altitude and velocity dependent wave-particle interaction lead to formation of H + and O + toroids at high altitudes in the auroral region.…”

Section: Introductionmentioning

confidence: 99%

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A Monte Carlo study for ion outflows at high altitude and high latitude: Barghouthi model

Barghouthi

2008

J. Geophys. Res.

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(r, v ? ) described in this paper and consequently, the Barghouthi model are appropriate to be used when modeling the ion's acceleration through wave-particle interactions (i.e., ion interactions with electromagnetic turbulence) in the auroral regions of Earth's magnetosphere. The model includes the effects of velocity-and altitude-dependent wave-particle interactions, gravitational field, polarization electrostatic field, and diverging auroral geomagnetic field lines. Also, we present much evidence, i.

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“…Other studies have considered the collisionless plasma outflows in the polar wind and auroral regions and have included the effect of wave-particle interactions. These studies have replaced the Fokker-Planck collision term in the Boltzmann equation by the effect of wave-particle interactions (e.g., Retterer et al, 1987Retterer et al, , 1994Crew et al, 1990;Barghouthi et al, 1998Barghouthi et al, , 2007Barghouthi et al, , 2008; Barghouthi and Atout, 2006;Barghouthi, 1997Barghouthi, , 2008Bouhram et al, 2003aBouhram et al, , b, 2004. In these studies the ion motion was followed along geomagnetic field lines under the effects of external forces (gravity and polarization electric field) and the interactions between the ion and the electromagnetic waves observed in those regions.…”

Section: Introductionmentioning

confidence: 99%

O<sup>+</sup> and H<sup>+</sup> ion heat fluxes at high altitudes and high latitudes

2014

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Abstract. Higher order moments, e.g., perpendicular and parallel heat fluxes, are related to non-Maxwellian plasma distributions. Such distributions are common when the plasma environment is not collision dominated. In the polar wind and auroral regions, the ion outflow is collisionless at altitudes above about 1.2 R E geocentric. In these regions wave-particle interaction is the primary acceleration mechanism of outflowing ionospheric origin ions. We present the altitude profiles of actual and "thermalized" heat fluxes for major ion species in the collisionless region by using the Barghouthi model. By comparing the actual and "thermalized" heat fluxes, we can see whether the heat flux corresponds to a small perturbation of an approximately biMaxwellian distribution (actual heat flux is small compared to "thermalized" heat flux), or whether it represents a significant deviation (actual heat flux equal or larger than "thermalized" heat flux). The model takes into account ion heating due to wave-particle interactions as well as the effects of gravity, ambipolar electric field, and divergence of geomagnetic field lines. In the discussion of the ion heat fluxes, we find that (1) the role of the ions located in the energetic tail of the ion velocity distribution function is very significant and has to be taken into consideration when modeling the ion heat flux at high altitudes and high latitudes; (2) at times the parallel and perpendicular heat fluxes have different signs at the same altitude. This indicates that the parallel and perpendicular parts of the ion energy are being transported in opposite directions. This behavior is the result of many competing processes; (3) we identify altitude regions where the actual heat flux is small as compared to the "thermalized" heat flux. In such regions we expect transport equation solutions based on perturbations of bi-Maxwellian distributions to be applicable. This is true for large altitude intervals for protons, but only the lowest altitudes for oxygen.

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The effect of altitude- and velocity-dependent wave–particle interactions on the H+ and O+ outflows in the auroral region

Cited by 5 publications

References 28 publications

Recent Progress in Physics-Based Models of the Plasmasphere

Recent Progress in Physics-Based Models of the Plasmasphere

A Monte Carlo study for ion outflows at high altitude and high latitude: Barghouthi model

O<sup>+</sup> and H<sup>+</sup> ion heat fluxes at high altitudes and high latitudes

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The effect of altitude- and velocity-dependent wave–particle interactions on the H+ and O+ outflows in the auroral region

Cited by 5 publications

References 28 publications

Recent Progress in Physics-Based Models of the Plasmasphere

Recent Progress in Physics-Based Models of the Plasmasphere

A Monte Carlo study for ion outflows at high altitude and high latitude: Barghouthi model

O&lt;sup&gt;+&lt;/sup&gt; and H&lt;sup&gt;+&lt;/sup&gt; ion heat fluxes at high altitudes and high latitudes

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O<sup>+</sup> and H<sup>+</sup> ion heat fluxes at high altitudes and high latitudes