The energization of charged particles, due to interaction with electromagnetic turbulence, has an important influence on the plasma outflow in space. The effect of wave-particle interaction (WPI) on O+ and H+ velocity distributions in the polar wind was investigated by using Monte Carlo method. The Monte Carlo simulation included the effect of WPI, gravity, polarization electrostatic field, and the divergence of geomagnetic field within the simulation tube (1.7-10 earth radii, Re) as the ions are heated due to WPI and move to higher altitudes, the ion's Larmor radius aL may become comparable to the perpendicular wave length λ⊥ of the electromagnetic turbulence. As the ratio aL/λ⊥ becomes ≥1, the quasi-linear perpendicular diffusion coefficient becomes velocity dependent, the heating rate becomes self-limited and the ion ditribution displays toroidal features. This result is consistent with observations of or toroidal distribution in the auroral region.

Title

Indian Journal of Physics, 01/2003; 77(6):621 – 624

Publisher

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Publisher Country

Palestine

Publication Type

Both (Printed and Online)

Volume

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Year

2003

Pages

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