tokens: We acknowledge NASA contract NAS5-02099 for use of data from the THEMIS Mission. Specifically, we thank C. W. Carlson and J. P. McFadden for the use of ESA data; K. H. Glassmeier, U. Auster, and W. Baumjohann for the use of FGM data; and D. Larson and R. P. Lin for the use of SST data. We also thank SILSO ( http://www.sidc.be/silso/datafiles ) for providing the sunspot numbers and the World Data Center ( http://wdc.kugi.kyoto-u.ac.jp/aeasy/index.html ) for providing the AE indices. This work is supported by the Science and Technology Development Fund of Macao SAR (008/2016/A1 and 119/2017/A3) and National Natural Science Foundation of China (NSFC) under grants 41564007 and 41374174.
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