Tianran Sun1, Chi Wang2, Fei Wei1, Z.-Q. Liu1, Jianhua Zheng1, Xi Zheng Yu1, Steven Sembay3 and Graziella Branduardi-Raymont4, (1)NSSC National Space Science Center, CAS, Beijing, China, (2)NSSC, CAS, Beijing, China, (3)University of Leicester, Leicester, United Kingdom, (4)University College London, Mullard Space Science Laboratory, London, United Kingdom
