Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm51a0267k&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM51A-0267
Physics
2437 Ionospheric Dynamics, 2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836)
Scientific paper
Using two-dimensional particle-in-cell simulations we study the linear and nonlinear effects of a large-scale shear Alfvén wave (LS-SAW) propagating parallel to the ambient magnetic field. We demonstrate that ion polarization drift in the propagating SAW drives cross-field instability (CFI) by ion-electron coupling and produces electrostatic (ES) waves, which accelerate electrons parallel and ions perpendicular to the ambient magnetic field. Even though the large-scale SAW has no parallel electric fields, the parallel electric field of the ES waves embedded in LS-SAW provide a novel acceleration mechanism for the electrons moving with the group velocity of the LS-SAW. Examining data from satellite observations, we find that the mechanism of CFI for plasma acceleration/heating powered by LS-SAWs is distinctly possible on auroral field lines.
Khazanov Igor
Singh Navinder
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