MHD structure of interplanetary disturbances observed near the earth during the solar-terrestrial storm of November 7–13, 2004

Abstract

This paper considers the MHD structure and configuration of near-Earth interplanetary disturbances during the heliospheric extrastorm of November 2004, taking into account the effect of the IMF sector structure and using the measurements of near-Earth satellites. During three successive disturbance intervals, the Earth entered, remained and left a relative narrow positive sector with flare-active region 10696, which generated a series of shocks and an active transequatorial filament. It has been indicated that the MHD structure and configuration of near-Earth disturbances substantially and specifically (for each position) depend on the IMF sector structure and interactions between shocks and sector boundaries, filaments, and magnetic clouds in these three different positions. Specifically, this manifested itself in multiple crossings of sector boundaries and considerable deformations of magnetic clouds. It has been indicated that the models of circular clouds are applied with limitations under the considered conditions.