Effects of Wave-Particle Interactions on Double-Hump Distributions of the H
+ Polar Wind |
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| Authors: | V Pierrard IA Barghouthi |
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| Institution: | (1) Belgian Institute for Space Aeronomy, 3 av. circulaire B-1180, Brussels, Belgium;(2) Department of Physics, Al-Quds University, East Jerusalem, P.O. Box 20002, West Bank, via, Israel |
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| Abstract: | A Monte Carlo simulation is used in order to study the effects of wave-particle interactions (WPI) on H+ distributions in the polar wind outflow. The simulation also considers effects of the gravity, the polarization electric
field, the divergence of geomagnetic field lines and H+−O+ Coulomb collisions. The proton velocity distribution function (VDF) and the profiles of its moments (density, bulk velocity,
parallel and perpendicular temperatures, heat flux…) are found for different levels of WPI, i.e., for different values of
the normalized diffusion rate in the velocity space (D
⊥). We find that the wave-particle interactions accelerate the polar wind and can have important effects on the double-hump
H+ distribution obtained in the transition region between the collision-dominated low altitudes and the collisionless high altitude
regions. |
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| Keywords: | polar wind wave-particle interactions coulomb collisions velocity distribution functions |
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