Computer Science – Numerical Analysis
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..783p&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 37, July 1989, p. 783-793.
Computer Science
Numerical Analysis
3
Auroral Arcs, Field Aligned Currents, Ionospheric Currents, Magnetosphere-Ionosphere Coupling, Polar Caps, Electron Precipitation, Numerical Analysis, Plasma Dynamics, Plasma-Electromagnetic Interaction
Scientific paper
The temporal evolution of low-energy (less than about 1 keV) plasma irregularities in the magnetosphere is studied. It is shown that, when convecting in the regions of inhomogeneous large-scale electric fields, such structures evolve to an arclike form, with resulting elongation nearly along the electric equipotentials. Being polarized by the magnetic gradient/curvature current, these magnetospheric seeds of arcs strongly disturb the background electric field and couple with the ionosphere by intense field-aligned currents. If the upward field-aligned current reaches large local values, field-aligned potential drop and visual auroral arcs in the ionosphere can develop. The polarization electric field inside the arc is superimposed on the large-scale electric field perturbation, so that the electric-field distribution in the arc region is close to that experimentally observed.
Golovchanskaia I. V.
Pudovkin Mikhail I.
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