Computer Science – Numerical Analysis
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21b..03e&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM21B-03
Computer Science
Numerical Analysis
2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
We present electric field, magnetic field, and charged particle observations from the upward current region of the aurora focusing on direct observations of parallel electric fields at the boundary between the auroral cavity and the ionosphere. The direct observations of the parallel electric field by the FAST and Polar satellites suggest that the ionospheric boundary of the auroral cavity is an oblique double layer that carries a substantial fraction (roughly 5% to 50%) of the auroral potential. A numerical solution to the Vlasov-Poisson equations in one dimension reproduces many of the properties of the observed electric fields, electron distributions, and ion distributions. The numerical analysis indicate that the ionospheric electron distribution which includes scattered primaries, auroral secondaries, and a cold population dominates the structure of the strong double layer. The result is a highly asymmetric double layer, with a strong, confined positive layer on the ionospheric side and a moderate, extended negative charge layer. This structure results with an asymmetric electric field, a feature also seen in the observations. The solutions need to be extended to two dimensions to better reproduce the observations.
Andersson L.-L.
Carlson Carl W.
Ergun Robert E.
Main D. S.
McFadden James P.
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