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tokens: We acknowledge Venus Express and Pioneer Venus Orbiter teams as well as the NASA Planetary Data System ( http://ppi.pds.nasa.gov ) for providing the data. We also thank ACE team and NASA CDAWeb for providing magnetometer data at 1 au, and the World Data Center SILSO ( http://www.sidc.be/silso/ ) for using the sunspot number data. 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 41731067.