Penetration of high-latitude electric fields into low latitudes

Details Penetration of high-latitude electric fields into low latitudes Penetration of high-latitude electric fields into low latitudes

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..411k&link_type=abstract

(International Symposium on Equatorial Aeronomy - I, 6th, Aguadilla, PR, July 17-23, 1980.) Journal of Atmospheric and Terrestri

Physics

25

Electric Fields, Ionospheric Currents, Magnetic Storms, Polar Regions, Tropical Regions, Current Distribution, Dynamo Theory, Field Aligned Currents, Ionospheric Conductivity, Ionospheric Electron Density, Solar Wind

Scientific paper

Simulation studies are conducted to examine the latitudinal penetration of the high-latitude electric field into middle and low latitudes, using an algorithm developed by Kamide and Matsushita (1979). The ionospheric electric potential is obtained from a numerical solution of the steady-state current continuity equation, assuming anisotropic conductivities as well as downward and upward currents along auroral field lines. When the conductivity is taken as constant, the values of the electric potential decay very slowly with an increase of the colatitude in middle and low latitudes. When the conductivity gradient is included in terms of both day-night asymmetry of the quiet-time conductivity and slight auroral enhancements in the night side auroral belt for weakly disturbed times, the decay of the electric field toward low latitudes occurs rapidly. Also, if the field-aligned currents in the equatorward half of the auroral belt are included, an extensive reduction of the electric field is seen in low latitudes, and a shielding effect against the penetration of the high-latitude electric field into low latitudes is produced. It is shown that the efficiency of the penetration is strongly controlled by ionospheric conductivities and field-aligned currents in auroral latitudes.

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