Field-aligned currents and ionospheric electric fields

Details Field-aligned currents and ionospheric electric fields Field-aligned currents and ionospheric electric fields

Mar 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1279y&link_type=abstract

Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1279-1284.

Physics

7

Current Distribution, Electric Fields, Electric Potential, Field Aligned Currents, Ionospheric Conductivity, Ionospheric Currents, Atmospheric Models, Magnetic Storms, Ohms Law, Polar Caps

Scientific paper

It is shown that the observed distribution of the ionospheric electric field can be deduced from an equation combining Ohm's law with the current continuity equation by using the 'observed' distribution of field-aligned currents as the boundary condition for two models of the ionosphere. The first model has one conductive annular ring representing the quiet-time auroral precipitation belt; the second has two conductive annular rings that simulate the discrete and diffuse auroral regions. An analysis is performed to determine how well the electric-field distribution can be reproduced. The results indicate that the first model reproduces the Sq(p)-type distribution, the second model reproduces reasonably well a substorm-type potential and ionospheric current patterns together with the Harang discontinuity, and that the distribution of field-aligned currents is the same for both models.

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