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选用东经20°子午链和北纬30°纬圈链台站地磁场H分量的分钟值数据,分析了2004年11月07~10日期间赤道环电流不对称性的时间演化特征.利用UT_MLT和UT_MLAT等值图来监测H分量的地方时分布、纬向分布和时间变化特征.结果表明:①UT_MLT等值线图清楚地显示,在急始之后的初相,H分量主要在正午附近增强,表明磁层顶查普曼-法拉罗电流所产生的地磁效应是主要原因.主相期间H分量最大负值出现在昏侧,表明环电流呈明显的晨-昏不对称分布.②UT_MLAT等值线图显示,磁暴期间磁扰变幅随纬度增高而减小,与Dst指数有很好的对应关系.磁扰的纬向分布提供了描述暴时环电流能量时间变化的新视点.③H分量的UT_MLT和UT_MLAT等值线图为实时监测环电流的时空分布提供了有效的手段.
The time evolution characteristics of the asymmetry of the equatorial ring currents during the period from 07 to 10 November 2004 were analyzed using the minute values of the H component of the geomagnetic field at 20 ° meridian and longitude latitude 30 ° latitudes and longitudes East China. The UT_MLT and UT_MLAT Contour map to monitor the local time distribution, latitudinal distribution and temporal variation of H component.Results show that: (1) UT_MLT contour map clearly shows that the initial phase and the H component increase sharply around noon after emergency start, indicating that magnetic The geomagnetic effect produced by the top Chapman-Farah current is the main reason.The maximum negative value of H component appears on the fainter side during the main phase, which indicates that the ring current has a clear morning-dusk asymmetric distribution.② UT_MLAT contour map shows , The amplitude of magnetic disturbance decreases with the increase of latitude and has a good correspondence with the Dst index during magnetic storm.The latitudinal distribution of magnetic disturbance provides a new viewpoint to describe the time variation of the current energy in the storm ring.③ UT_MLT and UT_MLAT Contour plots provide an effective means of monitoring the temporal and spatial distribution of ring current in real time.