Ionospheric closure of small-scale Birkeland currents

Details Ionospheric closure of small-scale Birkeland currents Ionospheric closure of small-scale Birkeland currents

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.1843f&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Feb. 1, 1991, p. 1843-1847.

Physics

27

Birkeland Currents, Earth Magnetosphere, Field Aligned Currents, Ionospheric Conductivity, Auroral Electrojets, Electric Fields, Ionospheric Currents, Satellite Observation

Scientific paper

The relationship between the spatial variations of the perpendicular electric field observed in the topside ionosphere and those of the magnetic field induced by the associated field-aligned currents is studied. The mapping of the magnetospheric electric field down to the ionosphere depends upon the spatial scale of its variations and, consequently, also the amplitude of the perpendicular currents and their divergence. This mapping is modeled using realistic conductivity profiles, and the dependence of the electric and magnetic fields upon the spatial scale is analyzed. The effective integrated Pedersen conductivity defined in the model is compared to Delta B/mu(0) Delta E, where Delta E and Delta B are the correlated variations of the mutually orthogonal electric and magnetic fields in the topside ionosphere. The variation of the effective integrated Pedersen conductivity is studied as a function of the scale of Delta E and Delta B flucuations. The limits of the present model and its possible improvements are discussed.

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