Physics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5051d&link_type=abstract
Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5051-5062.
Physics
20
Atmospheric Electricity, Auroral Arcs, Electric Fields, Radar Measurement, Electron Precipitation, Ionospheric Electron Density, Night Sky, Polarization Characteristics, Time Response
Scientific paper
Electric fields and horizontal currents associated with auroral arcs have been studied via the incoherent scatter radar at Chatanika, Alaska. Arcs are observed in the morning, evening, and at the midnight reversal of the north-south electric field. The observed electric field within the arcs is decreased in the evening, and increased in the morning. In all cases a southward polarization field within the arc is noted. This field's direction is determined by the east-west field direction, observed in all cases to be westward within the arc. It is suggested that the northward field variations constitute an ionospheric response to the increased conductivities, whereas the westward field variations originate above the region of enhanced conductivities. In one case the westward field behavior is associated with the low-energy electron precipitation. The amplitude and the direction of the electrojet current are influenced by the electric field variations. Current flows outside and inside the arcs are observed to be parallel to arc alignment and perpendicular to arc alignment, respectively
Baron Martin
de La Beaujardiere Odile
Vondrak Richard R.
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