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tokens: We thank J. T. Gosling for many helpful discussions. This work is supported by the Science and Technology Development Fund of Macao SAR (080/2012/A3), the National Natural Science Foundation of China (NSFC) under grants 41204123, 41374174, 41231068, and 41331070, and the Science Foundation of Jiangxi Province under grant 20144BAB2110005. 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 use of ESA, K. H. Glassmeier, U. Auster, and W. Baumjohann for use of FGM data, and D. Larson and R. P. Lin for use of SST data. We also thank ACE and Wind teams and NASA CDAWeb for providing the data.