Non-local kinetic theory of Alfven waves on auroral field lines

Details Non-local kinetic theory of Alfven waves on auroral field lines Non-local kinetic theory of Alfven waves on auroral field lines

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21b..07l&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SM21B-07

Physics

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 7827 Kinetic And Mhd Theory, 7867 Wave/Particle Interactions

Scientific paper

It has now become established that Alfven waves can carry sufficient energy for auroral acceleration processes, especially during disturbed times. While these waves are often treated in the two-fluid approximation, kinetic theory must be used to describe particle acceleration due to these waves. In the plasma sheet boundary layer, where plasma gradients are weak, the local approximation can be used to describe the wave-particle interactions due to Alfven waves. In this regime, Landau-resonant interactions can heat electrons along the magnetic field line, especially for higher values of the plasma beta and for short perpendicular wavelengths. These interactions can lead to strong damping of these waves, implying that their wave energy must be resupplied from nonlinear interactions. Closer to the Earth on auroral field lines, a non-local approach to the wave-particle interactions is necessary since the gradients in the plasma frequency become strong. In such a case, the full integration over the past history of the particle is necessary. In this case, the parallel electric field due to electron inertia is modified, and can be enhanced in some regions. Dissipation of the Alfven wave due to these wave-particle interactions can be significant when the perpendicular wavelength of the wave becomes comparable to the electron inertial length.

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