Net field-aligned currents controlled by the polar ionospheric conductivity

Details Net field-aligned currents controlled by the polar ionospheric conductivity Net field-aligned currents controlled by the polar ionospheric conductivity

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1056n&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 107, Issue A5, pp. SMP 4-1, CiteID 1056, DOI 10.1029/2001JA900177

Physics

2

Magnetospheric Physics: Current Systems (2409), Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Storms And Substorms

Scientific paper

The results of an analysis of the east-west magnetic variations at midlatitudes suggest that the net field-aligned currents, which are the integral of the downward and upward field-aligned currents along a meridian, are strongly controlled by the polar ionospheric conductivity. The east-west magnetic disturbances at midlatitudes are expected to be the magnetic effects of the net field-aligned currents in the polar region. We have examined the relation between the auroral electrojet intensity represented by the auroral electrojet (AE) index and the net field-aligned current intensity represented by the east-west magnetic disturbances at midlatitudes. It is deduced from this analysis that the net field-aligned currents are upward on the nightside and downward on the dayside. It is also derived that the net upward field-aligned currents on the nightside are stronger in winter than in summer. This seasonal dependence can be explained by the seasonal variation of the polar cap ionospheric conductivity.

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