Abstract

The knowledge of the relationship between the different parameters characterizing the solar wind magnetosphere coupling is an important goal in Solar - Terrestrial Physics. It has been widely accepted that the principal cause of the enhanced magnetospheric convection during the main phase of geomagnetic storms is due to increasements in the dawn - dusk component of the interplanetary electric field, which depends on the negative Bz-component (Bs) of the interplanetary magnetic field and on the solar wind velocity. This work shows results focused to find out a general relationship between Bs, the intensity of the magnetic storm characterized by the low latitude geomagnetic index Dst, and the associated time intervals. In this research, the period when the Bz-component is negative below a certain threshold value, the duration of the main phase, and the half time of the recovery phase are estimated and tested. Find