Intensification and fading of auroral arcs in the dusk-midnight sector of the polar cap

Details Intensification and fading of auroral arcs in the dusk-midnight sector of the polar cap Intensification and fading of auroral arcs in the dusk-midnight sector of the polar cap

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.7709w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, May 1, 1991, p. 7709-7719.

Physics

Auroral Arcs, Auroral Electrojets, Interplanetary Magnetic Fields, Polar Caps, Antarctic Regions, Electron Precipitation

Scientific paper

The process of intensification and fading of polar arcs observed near the dusk meridian is studied using data from two broad-field zenith-pointing photometers and an all-sky camera at South Pole station, together with IMF and AE index measurements. A comparison of these polar-arc phenomena with the AE index values showed that brief auroral intensifications and/or onsets of fading occurred during the growth phase of a substorm or near the start of the expansive phase; the fades terminated near the maximum in AE. For the three cases for which IMF data were available, the onsets of fading occurred 20-30 min after Bz turned southward.

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