Field-Aligned Current Evolution in Response to Different Ionospheric Boundary Conditions

Details Field-Aligned Current Evolution in Response to Different Ionospheric Boundary Conditions Field-Aligned Current Evolution in Response to Different Ionospheric Boundary Conditions

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2130b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2130

Physics

[2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2455] Ionosphere / Particle Precipitation, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems

Scientific paper

Field-aligned electric currents are central to the interaction between the ionosphere and the magnetosphere. Specifically, it is generally expected that they play a critical role in the evolution and morphology of active discrete auroral arcs. While the driver for the formation of field-aligned current is usually considered to be of magnetospheric origin, properties such as the ionospheric conductance and density irregularities can have a significant effect on the formation and evolution of narrow field-aligned current curtains. The presentation examines the effect of the ionospheric conductance on the formation and evolution of field-aligned electric currents. Of particular interest are also strong gradients of the ionospheric conductance. The topic is particularly important to the onset and evolution of discrete auroral precipitation if the mechanism for the parallel electric field formation depends of the local current properties.

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