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An X1.7 flare at 10:15 UT and a halo CME with a projected speed of 942 km/serupted from NOAA solar active region 9393 located at N20W19, were observed on2001 March 29. When the CME reached the Earth, it triggered a super geomagneticstorm (hereafter super storm). We find that the CME always moved towards theEarth according to the intensity-time profiles of protons with differentenergies. The solar wind parameters responsible for the main phase of the superstorm occurred on March 31, 2001 is analyzed taking into account the delayedgeomagnetic effect of solar wind at the L1 point and using the SYM-H index.According to the variation properties of SYM-H index during the main phase ofthe super storm, the main phase of the super storm is divided into two parts. Acomparative study of solar wind parameters responsible for the two parts showsthe evidence that the solar wind density plays a significant role intransferring solar wind energy into the magnetosphere, besides the southwardmagnetic field and solar wind speed.

Sun-Earth connection Event of Super Geomagnetic Storm on March 31, 2001: the Importance of Solar Wind Density