Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.6973w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, June 1, 1986, p. 6973-6978.
Physics
17
Auroral Zones, Earth Ionosphere, Earth Magnetosphere, Ionospheric Currents, Magnetosphere-Ionosphere Coupling, Solar Terrestrial Interactions, Space Plasmas, Atmospheric Electricity, Boundary Value Problems, Computerized Simulation, Field Aligned Currents, Magnetohydrodynamic Flow, Temporal Distribution, Three Dimensional Models
Scientific paper
A three-dimensional simulation model was developed to study magnetosphere-ionosphere coupling in the auroral region. One-fluid MHD equations are adopted to model the magnetosphere, and current density continuity equations were solved consistently to model the ionosphere. In the preliminary simulation runs described here, the electrodynamics of region 1 field-aligned currents were modeled. Initially, the electric field is taken to be in the magnetospheric equatorial plane. Alfven waves then propagate down to the ionosphere, accompanying a field-aligned current and exciting the electrostatic potential in the ionosphere by electrodynamic coupling. The results of the preliminary runs directly correspond with the fundamental characteristics of global magnetosphere-ionosphere coupling. These characteristics include an ionospheric electrostatic potential which varies in its development in time, depending upon the ratio of ionospheric resistance to magnetospheric impedance, the flowing of field-aligned currents into the ionosphere on the dawnside and out on the duskside, and the distribution along the geomagnetic field of the amplitude of the field-aligned current density in proportion to the field intensity.
Ashour-Abdalla Maha
Sato Takeshi
Watanabe Katsuhiro
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