Acknowledgments
This work was supported by the National Natural Science Foundation of China (grant nos. 42025404, 41674163, 41704162, 41974186, 41674162, 41904144, 41904143), the B-type Strategic Priority Program of the Chinese Academy of Sciences (grant no. XDB41000000), the pre-research projects on Civil Aerospace Technologies (grant nos. D020303, D020308, D020104) funded by the China National Space Administration, the National Key R&D Program of China (2018YFC1407303) and the China Postdoctoral Science Foundation Project (grant no. 2019M662700). We also acknowledge the Van Allen Probes mission, particularly the RBSPICE team, for providing particle data. athttp://rbspice.ftecs.com. Profiles of the solar wind parameters and geomagnetic indices are from the OMNI website (http://omniweb. gsfc.nasa.gov).