1. Department of General Education, Anhui Xinhua University , Hefei 230088 , China
2. Department of Geophysics and Space Sciences, School of Earth and Space Sciences, University of Science and Technology of China , Hefei 230026 , China
3. CAS Center for Excellence in Comparative Planetology/CAS Key Laboratory of Geospace Environment, University of Science and Technology of China , Hefei 230026 , China