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Manifestations of a sudden onset of the severe magnetic storm on November 20, 2003 in the generation of SC impulse, Psc pulsations and in the spatial modulation of auroral brightness
Solovyev S.I., Baishev D.G., Borisov G.V., Velichko V.A., Yumoto K.,
Results of comparison of auroral TV data at Tixie Bay and magnetic variations at geomagnetic latitudes ~60-66 degs during the magnetic storm onset at 0803 UT on November 20,2003 caused by a sharp growth of dynamic solar wind pressure and significant increase of positive IMF By by using data from ACE are presented. It is found that ~20 min before the magnetic storm onset, the increase of diffuse aurora brightness in the evening sector (~1640-1700 LT) poleward of the station zenith and the increase of the eastward electrojet intensity are observed. The sudden preliminary impulse of ~2 min duration is accompanied by the arc brightness near the Tixie zenith with the following expansion of aurora to the pole at 0806 UT by ~4 deg with the velocity of ~3 km/s, and to the east. This aurora expansion lasted for ~3 min. The analogous expansions of aurora were repeated then with quasi-periods ~5-10 min till ~0845 UT. Such a spatial modulation in the aurora brightness is accompanied by intense Psc pulsations with the maximum H-component amplitude ~250 nT at geomagnetic latitudes 65-66 degs with the similar oscillation periods. The interpretation of results obtained is given.
The work was partially supported by RFBR grant 03-05-39011-GFEN.