Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4083k&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4083-4115.
Physics
12
Atmospheric Electricity, Electric Fields, Field Aligned Currents, Ionospheric Currents, Auroral Zones, Current Distribution, Geomagnetism, Plasma Conductivity, Polar Regions
Scientific paper
Computer simulation studies of the electric fields and currents in the global ionosphere produced by field-aligned electric currents for quiet periods are presented. The steady state equations for current conservation are solved numerically by assuming, (1) divided regions of the global earth such as the polar cap, auroral zone, and middle-low latitudes, (2) exponentially distributed anisotropic electric conductivities for each zone with a continuous change at the boundaries of the regions, and (3) exponentially distributed field-aligned current intensities in the auroral region. Resultant computer-plotted diagrams include equipotential contours of the electric fields, vector distributions of the electric fields and currents, and electric current patterns equivalent to the magnetic field effect produced by the field-aligned and real ionospheric currents. It is concluded that conductivity inhomogeneity alters the electric field pattern previously obtained by assuming uniformity conductivity distribution and a slight conductivity enhancement along the nightside auroral belt results in a large modification of the electric field. In addition, it is shown that the basic substorm characteristics of the observed electric fields and currents in the ionosphere can be reproduced reasonably well by numerical models for the distribution of the ionosphere conductivities and the field-aligned currents.
Kamide Yohsuke
Matsushita Satoki
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