Ionospheric and Birkeland current distributions inferred from the MAGSAT magnetometer data

Physics

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Auroral Electrojets, Birkeland Currents, Current Distribution, Current Sheets, Hall Effect, Magnetic Field Configurations, Magsat Satellites, Field Aligned Currents, Fourier Transformation, Magnetic Storms, Magnetometers, Satellite Observation

Scientific paper

Ionospheric and field-aligned sheet current density distributions are presently inferred by means of MAGSAT vector magnetometer data, together with an accurate magnetic field model. By comparing Hall current densities inferred from the MAGSAT data and those inferred from simultaneously recorded ground based data acquired by the Scandinavian magnetometer array, it is determined that the former have previously been underestimated due to high damping of magnetic variations with high spatial wave numbers between the ionosphere and the MAGSAT orbit. Among important results of this study is noted the fact that the Birkeland and electrojet current systems are colocated. The analyses have shown a tendency for triangular rather than constant electrojet current distributions as a function of latitude, consistent with the statistical, uniform regions 1 and 2 Birkeland current patterns.

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