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It is generally believed that the occurrence of a magnetic storm depends upon the solar wind conditions, particularly the\udsouthward interplanetary magnetic field (IMF) component. To understand the relationship between solar wind parameters\udand magnetic storms, variations in magnetic field polarity and solar wind parameters during magnetic storms are\udexamined. A total of 156 storms during the period of 1997~2003 are used. According to the interplanetary driver, magnetic\udstorms are divided into three types, which are coronal mass ejection (CME)-driven storms, co-rotating interaction\udregion (CIR)-driven storms, and complicated type storms. Complicated types were not included in this study. For this\udpurpose, the manner in which the direction change of IMF By and Bz components (in geocentric solar magnetospheric\udcoordinate system coordinate) during the main phase is related with the development of the storm is examined. The\udtime-integrated solar wind parameters are compared with the time-integrated disturbance storm time (Dst) index during\udthe main phase of each magnetic storm. The time lag with the storm size is also investigated. Some results are worth\udnoting: CME-driven storms, under steady conditions of Bz < 0, represent more than half of the storms in number. That is,\udit is found that the average number of storms for negative sign of IMF Bz (T1~T4) is high, at 56.4%, 53.0%, and 63.7% in\udeach storm category, respectively. However, for the CIR-driven storms, the percentage of moderate storms is only 29.2%,\udwhile the number of intense storms is more than half (60.0%) under the Bz < 0 condition. It is found that the correlation\udis highest between the time-integrated IMF Bz and the time-integrated Dst index for the CME-driven storms. On the\udother hand, for the CIR-driven storms, a high correlation is found, with the correlation coefficient being 0.93, between\udtime-integrated Dst index and time-integrated solar wind speed, while a low correlation, 0.51, is found between timeintegrated\udBz and time-integrated Dst index. The relationship between storm size and time lag in terms of hours from Bz\udminimum to Dst minimum values is investigated. For the CME-driven storms, time lag of 26% of moderate storms is one\udhour, whereas time lag of 33% of moderate storms is two hours for the CIR-driven storms. The average values of solar\udwind parameters for the CME and CIR-driven storms are also examined. The average values of |Dstmin| and |Bzmin| for the\udCME-driven storms are higher than those of CIR-driven storms, while the average value of temperature is lower

Variation of Magnetic Field (By, Bz) Polarity and Statistical Analysis of Solar Wind Parameters during the Magnetic Storm Period