1. Chinese Academy of Sciences Key Laboratory of Geospace Environment, University of Science and Technology of China, Hefei 230026, China.
2. Space Research Institute, Austrian Academy of Sciences, Graz 8042, Austria.
3. Institute of Geophysics and Planetary Physics, University of California, Los Angeles (UCLA), CA 90095–1567, USA.
4. Centre d’Etude Spatiale des Rayonnements, Toulouse 31028, France.
5. Swedish Institute of Space Physics, Kiruna 98128, Sweden.
6. Mullard Space Science Laboratory, University College London, London RH5 6NT, UK.
7. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
8. Space Science Institute, Beihang University, Beijing 100191, China.
9. Institut für Geophysik und Extraterrestrische Physik, Technischen Universität Braunschweig, Braunschweig 38106, Germany.
10. Department of Automatic Control and Systems Engineering, University of Sheffield, Sheffield S1 3JD, UK.