Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4189n&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4189-4200.
Physics
12
Auroras, Ionospheric Currents, Ionospheric Drift, All Sky Photography, Auroral Arcs, Magnetic Effects, Nocturnal Variations
Scientific paper
Several examples of the ionospheric drift patterns and of the aurora near the Harang discontinuity are presented. The drift patterns were detected with the Scandinavian twin auroral radar experiment, and the auroral features were determined by all-sky camera data. The behavior of the discontinuity as a function of magnetic activity and the equatorward surge are discussed, noting that the surge of an east-west-aligned discontinuity appears to be associated with a region of strong equatorward electron flow which splits into eastward and westward flows. The eastward termination and the equatorward surges are considered, and this discontinuity did not appear to be strongly affected by substorms. It is concluded that auroral arcs are located in or poleward of the discontinuity, even though active arcs at times appear south of the discontinuity. Diffuse aurora was observed only equatorward of the discontinuity.
Greenwald Ray A.
Nielsen Edward
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