Physics – Plasma Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3420111k&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 20, CiteID L20111
Physics
Plasma Physics
3
Ionosphere: Wave/Particle Interactions (7867), Interplanetary Physics: Plasma Waves And Turbulence, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Space Plasma Physics: Wave/Particle Interactions (2483, 6984)
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 Bo. 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 Bo. Even though the large-scale SAW has no parallel electric field E $\parallel$ , the E $\parallel$ of the ES wave fields 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 suggest that the mechanism of CFI for plasma acceleration/heating powered by LS-SAWs is distinctly possible on auroral field lines.
Khazanov Igor
Singh Nagendra
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