1. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
2. Space and Atmospheric Physics Group Blackett Laboratory Imperial College London London UK
3. Mullard Space Science Laboratory University College London Dorking UK
4. Laboratoire de Physique Atmospherique et Planetaire STAR Institute Universite de Liege Liege Belgium
5. Department of Earth Sciences The University of Hong Kong Hong Kong SAR China