Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm41c..03s&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM41C-03
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions
Scientific paper
Previously, Lessard and Knudsen [2001] showed that reflection of a shear Alfven wave with sub-kilometer transverse wavelength from the ionosphere is negligible. In the present paper, we study the effect of the transverse wavelength on interaction between an Alfven wave and the ionosphere using a two-dimensional multi-fluid numerical model of low-altitude auroral flux-tubes. We focus on the role of dissipation due to the intense parallel electric currents and parallel electric fields which are generated in the ionosphere by the waves with short tranverse spatial scale. The parallel electric field is obtained from the condition of divergence-free electric current in order to maintain quasineutrality. The electromagnetic solver of the model combines the quasineutrality equation with the Maxwell equations. The ionosphere is described realistically, similar to [Schunk, 1988], and includes a detailed chemistry model, collisions between charged particles, and neutral winds. Lessard, M.R. and D. J. Knudsen (2001), Geophys. Res. Lett., 28, 3573. Schunk, R. W. (1988), PAGEOPH, 127, 255.
Rankin Robert
Sydorenko D.
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