1. CAS Key Laboratory of Geospace Environment, Department of Geophysics and Planetary Science University of Science and Technology of China Hefei China
2. Shandong Provincial Key Laboratory of Optical Astronomy and Solar‐Terrestrial Environment Shandong University Weihai China
3. Department of Physics Auburn University Auburn AL USA
4. College of Mathematics and Physics Qingdao University of Science and Technology Qingdao China