1. Royal Belgian Institute for Space AeronomyBIRA‐IASB Brussels Belgium
2. LPAP, STAR InstituteUniversité de Liège Belgium
3. NASA Goddard Space Flight Center Greenbelt MD USA
4. Space Science Institute Boulder CO USA
5. Instituto de Astrofisica de Andalucia, IAA‐CSIC, Glorieta de la Astronomia Granada Spain
6. Department of Physical SciencesThe Open University Milton Keynes UK
7. Istituto di Astrofisica e Planetologia Spaziali, IAPS‐INAF Rome Italy