1. Space Sciences Laboratory University of California Berkeley Berkeley Ca USA
2. LATMOS‐IPSL‐UVSQ‐CNRS Guyancourt France
3. Laboratoire de Physique des Plasmas, UMR7648, CNRS, Ecole Polytechnique, UPMC, Université Paris 06, University of Paris‐Sud Paris France
4. NASA Goddard Space Flight Center Greenbelt MD USA
5. KTH Royal Institute of Technology Stockholm Sweden