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

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

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11308209b&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A8, CiteID A08209

Physics

1

Magnetospheric Physics: Cusp, Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Electromagnetics: Plasmas

Scientific paper

A comparison has been made between the results of three different wave-particle interactions models, RCC model, Bouhram model, and Barghouthi model. These models have been used for investigating the H+ and O+ ion outflows at high altitudes equatorward of the cusp, and their simulation results have been compared to the corresponding observations. The comparison showed that the simulation results of O+ ion temperature (202 eV), H+ ion temperature (74 eV), and H+ and O+ ions velocity distributions (toroids) at 4.8 R E , geocentric distance, in the equatorward region of the cusp, obtained by using Barghouthi model, when the characteristic perpendicular wavelength of the electromagnetic turbulence λ $\perp$ = 8 km, are close to the corresponding observations, T(O+) = 200 eV, T(H+) = 78 eV, and H+ and O+ toroids at 4.8 R E . This close agreement between Monte Carlo simulations and observations provides evidence that the diffusion coefficient, D $\perp$ (r, v $\perp$ ) 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.e., comparisons between the simulations results of Barghouthi model for H+ and O+ ions outflows with the corresponding observations at different altitudes in the auroral region, that support the choice of Barghouthi model.

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