基金This work was supported by National Natural Science Foundation of China （Grant Nos. 41174147, 41274170, 41331070）, China Postdoctoral Science Foundation Funded Project, and the Fundamental Research Fund for theCentral Universities （Grant No. 2042014kf0017）. We acknowledge NASA contract NAS5-02099 and V Angelopoulos for use of data from the THEMIS Mission. Specifically, we thank C W Carlson and J P McFadden for the use of ESA data, D Larson and R P Lin for the use of SST data, K H Glassmeier, U Auster, and W Baumjohann for the use of FGM data. We also thanks ZHANG Hui, LIU Jiang and CHU XiangNing for their discussion and helpful suggestions.