Shandong Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment of Space Sciences University Shandong 264209;
School of Space Science and Physics University Shandong 264209;
Department of Space Physics of Electronic Information University 430072;
CAS Center for Excellence in Comparative Planetology 230026;
CAS Key Laboratory of Geospace Environment of Geophysics and Planetary Sciences of Science and Technology of China 230026;
Staunch Data Analytics Lab Hampshire;
electron injections; relativistic electrons; the Earth’s outer radiation belt; plasma sheet; Van Allen Probes;