Role of field-aligned currents in generation of high-latitude magnetic disturbances

Details Role of field-aligned currents in generation of high-latitude magnetic disturbances Role of field-aligned currents in generation of high-latitude magnetic disturbances

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27.1451t&link_type=abstract

Planetary and Space Science, vol. 27, Dec. 1979, p. 1451-1459.

Computer Science

1

Field Aligned Currents, Geomagnetism, Ionospheric Currents, Magnetic Disturbances, Polar Substorms, Auroral Zones, Interplanetary Magnetic Fields, Magnetic Effects

Scientific paper

The distant effects of the field-aligned currents (FAC) observed by TRIAD are computed for conditions of low and moderate activity. The systems of total ionospheric currents (both Hall and Pedersen) generated by corresponding FAC are also examined and the contribution of the distant effects and the ionospheric currents into the total equivalent current system is estimated. The conclusions are as follows. In cases of low magnetic activity the magnetic effects produced by Pedersen currents are mainly cancelled by the FAC distant effect in accord with Fukushima's theorem. In cases of moderate activity when the zone of high ionospheric conductivity and the two-sheet FAC structure are present the FAC distant effect is too small to cancel the effect of Pedersen currents. For these conditions the system of total ionospheric currents shows the best correspondence with the experimental equivalent current system. Effects produced by the IMF azimuthal component are also analyzed.

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