1. Space Science Institute, School of Astronautics; Beihang University; Beijing China
2. RAL; Didcot UK
3. The Institute of Crustal Dynamics; CEA; Beijing China
4. GFZ; Potsdam Germany
5. NSSC, CAS; Beijing China
6. DTU Space; Lyngby Denmark
7. CSW, Institute of Space Sciences; Shangdong University; Weihai China
8. ESA/ESTEC; Noordwijk Netherlands