Manifestations of sudden commencement of a severe magnetic storm of November 20, 2003, in generation of an SC pulse, P SC pulsations, and spatial modulation of the auroral brightness

Details Manifestations of sudden commencement of a severe magnetic storm of November 20, 2003, in generation of an SC pulse, P SC pulsations, and spatial modulation of the auroral brightness Manifestations of sudden commencement of a severe magnetic storm of November 20, 2003, in generation of an SC pulse, P SC pulsations, and spatial modulation of the auroral brightness

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cosre..42..583b&link_type=abstract

Cosmic Research, Volume 42, Issue 6, pp.583-590

Computer Science

Scientific paper

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 P SC 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 P SC were observed against the background of intensification of a two-cell DP2 type current system and were accompanied by multiple turnings of the IMF B z from south to north and back. It is assumed that the source of P SC pulsations was a modulation of the intensity of the DP2 ionosphere currents as a result of variations of the magnetosphere convection level.

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