Abstract The results of investigation of the geomagnetic and auroral response to the commencement of a severe magnetic storm of November 20, 2003, are presented. It is established that the onset of SC led to the brightening of the auroral arc in the dusk sector for 2–3 min with its extent to the east with a velocity of 10–20 km/s and to displacement poleward with a velocity of ∼1.0 km/s. Furtheron, the fast auroral expansions of short duration (∼5 min) to the pole up to ∼2–4°were observed, repeating every 5–10 min during ∼40 min, which led to the spatial modulation of the brightness of the glow and to generation of PSC pulsations with similar periods of oscillations. The broadening of aurora poleward had a steplike character, with generation of new arcs poleward of previous ones ∼5 arcs per ∼1.5 min. The modulation of brightness of the glow and PSC were observed against the background of intensification of a two-cell DP2 type current system and were accompanied by multiple turnings of the IMF Bz from south to north and back. It is assumed that the source of PSC pulsations was a modulation of the intensity of the DP2 ionosphere currents as a result of variations of the magnetosphere convection level.
Manifestations of sudden commencement of a severe magnetic storm of November 20, 2003, in generation of an SC pulse, PSC pulsations, and spatial modulation of the auroral brightness
Cosmic Research ; 42 , 6 ; 583-590
2004-11-01
8 pages
Article (Journal)
Electronic Resource
English
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