场向电流（FACs）在太阳风-磁层-电离层耦合过程中起着重要作用，它是磁层和电离层的联系纽带。强磁暴（Dst≤-100nT）期间场向电流对不同太阳风结构的响应及其空间分布特征一直缺乏统计分析。本课题拟利用CHAMP、Polar、Orsted卫星磁场绝对矢量观测计算、分析两种行星际激波（准垂直、准平行）、八类IMF Bz/ICMEs结构下不同扇区大尺度场向电流的暴时特征，包括电流密度、纬度随行星际条件变化的空间分布和长期变化特征，并通过研究不同扇区暴时FACs与环电流、极光电急流活动的相关性，探索研究高、低纬电流与场向电流能量输运、交换的动力学过程。本课题将总结、评价各种行星际条件下太阳风-磁层-电离层耦合的效能，研究成果对深入理解暴时太阳风-磁层-电离层耦合过程具有重要意义。

FACs which connects magnetosphere and ionosphere plays a significant role during the solar wind-magnetosphere-ionosphere coupling process. There always have been lacked the works of the statistical studies on the characteristics of FACs for different solar wind structure conditions during the geomagnetic storm events. In this work, in intense geomagnetic storms, by use of the geomagnetic observations of CHAMP, Polar, Orsted satellites, we intend to study large-scale FACs characteristics in different LT sectors of current densities and current sheets latitudinal distribution, and analyze the longtime variation characters of FACs. Besides, we will deeply investigate the correlation activities between large-scale FACs of different LT sector and ring current, as well as auroral electrojets. The resultes will be useful for understanding solar wind-magnetosphere-ionosphere coupling process during geomagnetic storms.