Effects of Wave-Particle Interactions on Double-Hump Distributions of the H + Polar Wind

Pierrard, Viviane; Barghouthi, I. A.

doi:10.1007/s10509-005-9002-y

Cited by 5 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In subsequent Monte Carlo simulations, Barakat and Barghouthi (1994) examined the effect of wave-particle interactions on the velocity distribution of polar wind H + and O + ions flowing out of the ionosphere along magnetic field lines (Barakat et al 1995). Effects of wave-particle interactions on Lorentzian VDFs were analyzed in Pierrard and Barghouthi (2006). 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.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Recent Progress in Physics-Based Models of the Plasmasphere

et al. 2009

View full text Add to dashboard Cite

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.

show abstract

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Recent Progress in Physics-Based Models of the Plasmasphere

et al. 2009

View full text Add to dashboard Cite

show abstract

“…(6) and (7) is the weakest there. The effect of Coulomb collisions may change the shape of the ion velocity distribution (Pierrard and Barghouthi, 2006), which, in turn, affects the heat flux.…”

Section: Applicability Of Our Resultsmentioning

confidence: 99%

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

2014

View full text Add to dashboard Cite

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.

show abstract

“…The results of the polar wind study indicated that both the density and outflow velocity of the O + ions are strongly related to the level of the wave energy; the escape flux of these heavy ions could be enhanced by a factor of 10 5 with strong WPI. Pierrard and Barghouthi (2006) have also studied the effects of the WPI on the double-hump H + ion velocity distribution function in the polar wind.…”

Section: Modeling Of Non-classical Polar Wind Effectsmentioning

confidence: 99%