Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32c..04b&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32C-04
Physics
2704 Auroral Phenomena (2407), 2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet
Scientific paper
Using two-dimensional steady-state Vlasov theory, we investigate properties of thin current sheets that result from exact particle motion. The self-consistent quasi-neutral structure of such current sheets generally requires the presence of an electric potential, which is constant along field lines. We explore the possible association with the perpendicular electric fields that are part of the U-shaped potential structures above auroral arcs. For sufficiently small scales, the converging perpendicular electric field corresponds to two oppositely directed thin Hall current sheets. We construct such double current sheet models and confirm that they result in potentials with the postulated shape and, for sufficiently small scales, in potential differences of up to the ion thermal potential. The formation of such thin double current sheets is found in simulations of an earthward collapsing entropy-depleted magnetic flux tube (``bubble"), This may provide a further link between bursty bulk flows, bubbles, and auroral features.
Birn Joachim
Hesse Matthias
Raeder Joachim
Schindler Karl
Wang Yadong
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