1. SOA Key Laboratory for Polar Science Polar Research Institute of China Shanghai China
2. Department of Atmospheric and Oceanic Sciences University of California Los Angeles California USA
3. Department of Earth, Planetary, and Space Sciences University of California Los Angeles California USA
4. Birkeland Centre for Space Science, Department of Arctic Geophysics University Centre in Svalbard Longyearbyen Norway
5. Department of Physics University of Oslo Oslo Norway
6. Department of Electrical and Computer Engineering and Center for Space Physics Boston University Boston Massachusetts USA