Propagation of Kinetic Alfvén Waves at the Plasma Sheet Boundary Layer

Details Propagation of Kinetic Alfvén Waves at the Plasma Sheet Boundary Layer Propagation of Kinetic Alfvén Waves at the Plasma Sheet Boundary Layer

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1697l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1697

Physics

[2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2753] Magnetospheric Physics / Numerical Modeling, [2790] Magnetospheric Physics / Substorms

Scientific paper

Polar satellite observations have indicated that kinetic Alfvén waves are frequently observed at the plasma sheet boundary layer. These waves have a short perpendicular wavelength which implies the existence of parallel electric fields, and are associated with field-aligned electron populations that are accelerated by these fields. These waves are likely the result of linear mode conversion due to the Alfvén speed gradient at the boundary layer, and phase mix to form the short perpendicular scales. We present a numerical model of this process that includes the effect of Landau damping on the wave propagation and that uses perfectly matched boundary conditions to eliminate reflections at the boundaries. While most previous models of auroral acceleration have concentrated on a the low-altitude acceleration region at altitudes of a few thousand kilometers, these results indicate that the larger beta region at radial distances of 4-6 Earth radii can also be a site of significant auroral acceleration.

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