Physics – Plasma Physics
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...101.5343s&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A3, p. 5343-5358
Physics
Plasma Physics
42
Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Space Plasma Physics: Kinetic And Mhd Theory, Magnetospheric Physics: Numerical Modeling
Scientific paper
The fine structure of dispersive Alfvén wave resonance layers extending along magnetic field lines from northern to southern auroral ionospheres is investigated using a magnetically incompressible, linear, two-fluid model. The model includes effects of finite electron inertia (at low altitude) and finite electron pressure (at high altitude). Plasma parameters are chosen so that refraction by the parallel inhomogeneity causes the dispersive Alfvén wave to become trapped in the resonance layer. The parallel and perpendicular structure of these nonradiative, dispersive resonance layers is computed for the first four odd harmonics. A significant enhancement of the perpendicular and parallel components of the electric field near the ionosphere is found. The instantaneous potential drop along the magnetic field is sufficient to accelerate electrons up to several keV. The thickness of field line resonance layers in the ionosphere is estimated to be less than 5 km. The results suggest that dispersive resonance layers produce subkilometer-scale, multiple, discrete auroral arcs.
Lotko William
Streltsov Alexander
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