A simple explanation for cross-field diffusion process by kinetic Alfven waves

Details A simple explanation for cross-field diffusion process by kinetic Alfven waves A simple explanation for cross-field diffusion process by kinetic Alfven waves

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm51b1782i&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM51B-1782

Physics

Plasma Physics

[2724] Magnetospheric Physics / Magnetopause And Boundary Layers, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7859] Space Plasma Physics / Transport Processes, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

We reconsider the diffusion process by kinetic Alfven waves (KAWs). The diffusion coefficient derived from a quasi-linear theory has been used in many papers in order to discuss the contribution of KAWs to the formation of the low-latitude boundary layer. Behavior of diffused particles in KAWs, however, is not clearly understood because the theory does not include finite Larmor radius effect although the perpendicular wavelength of KAWs is comparable to ion gyroradius. We perform test particle simulations to examine how particles diffuse via KAWs. It is shown that the cross-field transport occurs efficiently for particles satisfying the condition V∥=ω/k∥ and k⊥ρ≤1.6, where ω, k and ρ are angular frequency, wavenumber and gyroradius, respectively. Those particles can remain in almost the same wave-phase and can keep feeling wave-induced force in almost the same direction. This causes particle drift motion in the direction of perturbed magnetic field, resulting in the cross-filed diffusion.

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