Physics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..227m&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Jan. 1, 1984, p. 227-235.
Physics
37
Auroral Zones, Interplanetary Magnetic Fields, Magnetic Storms, Space Plasmas, Equatorial Atmosphere, Latitude, Night Sky, Ring Currents
Scientific paper
Nearly continuous observations of the nightside auroral oval position during three intense geomagnetic storms with a time resolution of about 30 min are reported. The variation of the midnight oval in association with the interplanetary magneticfield B(z) component and with the evolution intensity of the storm-time ring current inferred from the Dst index is investigated. The storm-time dynamics of the midnight part of the oval is compared with that of the polar cusp region. The large equatorial shift of the auroral oval occurs in coordination with the equatorward motion of the polar cusp region, and the cusp is displaced by a few degrees more than the nightside auroral oval near the peak of a magnetic storm. The midnight auroral oval recovers more slowly than the polar cusp region during the storm recovery phase. The midnight oval and the noon sector cusp region move coherently with the southward variation of B(z), but not necessarily with the Dst intensity variations.
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