Shan Wang, Peking University, Institute of space physics and applied technology, Beijing, China, Lei Dai, National Space Science Center, Chinese Academy of Sciences, Beijing, China, Chao Yue, Peking University, School of Earth and Space Sciences, Beijing, China, Colin Forsyth, UCL Mullard Space Science Laboratory, Dorking, United Kingdom, Christian Lao, University College London, Department of Space and Climate Physics, London, United Kingdom, Qiugang Zong, Peking University, Institute of Space Physics and Applied Technology, Beijing, China, Chao Xiong, Wuhan University of Technology, Space Physics, Wuhan, China and Boyi Wang, HIT Harbin Institute of Technology, Harbin, China