Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.217..257k&link_type=abstract
In ESA Achievements of the Intern. Magnetospheric Study (IMS) p 257-266 (SEE N85-24544 14-46)
Physics
Auroras, Cross Coupling, Dynamic Models, Earth Ionosphere, Earth Magnetosphere, Electrohydrodynamics, Magnetic Storms, Magnetosphere-Ionosphere Coupling, Convection, Current Sheets, Field Aligned Currents, Magnetohydrodynamic Waves, Plasma Loss, Sudden Storm Commencements
Scientific paper
A theoretical model of substorms is presented. Sudden enhancement of convection in the plasma sheet launches an Alfven wave propagating toward the ionosphere in each hemisphere. An Alfven wave carries with it a field-aligned current and a polarization electric field which is the convection electric field itself. When the field-aligned current density exceeds the loss-cone limit, a nonzero parallel electric field is forced into existence to accelerate the precipitating electrons so that the current density can be enhanced to the level required by magnetosphere-ionosphere coupling. Reflections of Alfven waves produce oscillations in the auroral electrojet currents, causing the Pi2 pulsation signature in ground-based magnetometer data. As the waves reflect between conjugate ionospheres, the field-aligned current density of the wave increases, causing the parallel electric field to develop, leading to the brightening of auroral arcs and the enhancement of ionospheric conductivity surrounding bright auroras.
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