Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa51b0250d&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SA51B-0250
Physics
7843 Numerical Simulation Studies, 2431 Ionosphere/Magnetosphere Interactions (2736), 2439 Ionospheric Irregularities
Scientific paper
Polar cap patches are regions of enhanced plasma density that form in the dayside cusp or equatorward of the cusp during periods of southward IMF and then convect in an antisunward direction across the polar cap. The density enhancement in a patch relative to the background ionospheric density varies over a wide range, from a few percent to a factor of 100. A horizontal cross-section of a polar cap patch can appear roughly circular or cigar-shaped, and patches are typically from about 200 to 1000 km across. We have used a time-dependent, 3-dimensional, fluid model of the coupled ionosphere-polar wind system to model the evolution of a representative polar cap patch and to study its effect on the polar wind for a range of seasonal and solar-cycle conditions. This model calculates the plasma dynamics in a large number (about 1500) of flux tubes as they move horizontally across the polar region under the influence of corotational and magnetospheric convection electric fields. The large number of flux tubes included in a simulation makes it possible to model mesoscale features of the ionosphere, such as plasma patches.
Demars Howard G.
Schunk Robert W.
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