Physics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..403m&link_type=abstract
(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri
Physics
4
Computerized Simulation, Electromagnetic Interactions, Ionospheric Currents, Polar Regions, Tropical Regions, Current Distribution, Electric Fields, Field Aligned Currents, Interplanetary Magnetic Fields, Ionospheric Conductivity
Scientific paper
The transient behavior of the electromagnetic interactions in the ionosphere between high and low latitudes is examined by computing the ionospheric electric fields and currents flowing along the geomagnetic field lines between the magnetosphere and the ionosphere, using realistic electric conductivity models for the polar cap, the auroral zone, and the middle-low latitudes. Downward and upward field-aligned currents with exponential density distributions in latitude and longitude are assumed on the basis of recent spacecraft measurements. An outline of the numerical solution of the current conservation equation is presented, giving the distributions of the electric fields and currents, which are computed for every 30 s intervals in the magnetospheric substorm life cycle. The simulated results are compiled as three sequences in the form of a 16-mm color movie (which compresses real time by a factor of 1/180, taking 1.7 min per sequence): variations of the electric equipotential contours, changes in the electric current vectors, and fluctuations of the electric current systems. The simulation shows rapid and large-scale interactions between the auroral zone and middle-low latitudes during the substorm sequence.
Kamide Yohsuke
Matsushita Satoki
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