1. Department of Space Physics, School of Electronic InformationWuhan University Wuhan China
2. Department of Mathematics and StatisticsMemorial University of Newfoundland St. John's Newfoundland Canada
3. Department of Atmospheric and Oceanic SciencesUniversity of California Los Angeles California USA
4. Department of Geophysics and Planetary SciencesUniversity of Science and Technology of China Hefei China
5. Helmholtz Centre PotsdamGFZ German Research Centre for Geosciences Potsdam Germany
6. Department of Earth, Planetary, and Space SciencesUniversity of California Los Angeles California USA