Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.9071r&link_type=abstract
Journal of Geophysical Research, vol. 87, Nov. 1, 1982, p. 9071-9076. Research supported by the Natural Sciences and Engineerin
Physics
5
Auroral Electrojets, Field Aligned Currents, Geomagnetism, Ionospheric Currents, Magnetic Disturbances, Amplitudes, Latitude, Magnetometers, Satellite Observation
Scientific paper
It is shown that in the post-noon quadrant, the combination of field-aligned currents associated with the eastward auroral electrojet and polar cap currents produces a magnetic field perturbation pattern on the ground and at TRIAD altitude (800 km) in good agreement with observations. This model permits downward net field-aligned current flow across the post-noon sector auroral oval while at the same time replicating the observation of a sharp level shift in the east-west component of the magnetic perturbation field at 800-km altitude attributed, until now, to net upward field-aligned current. These results reconcile the contentions of Hughes and Rostoker (1977, 1979) that there is net downward field-aligned current across the post-noon auroral oval and of Sugiura and Potemra (1976) that the net current flow in the post-noon quadrant is upward.
Mareschal Marianne
Rostoker Gordon
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