Frederic E. Vincent LATMOS Lotfi Ben-Jaffel CNRS, Institut d'Astrophysique de Paris John T. Clarke Boston University Walter M. Harris University of Arizona Vladislav V. Izmodenov Space Research Institute of the Russian Academy of Sciences Olga Katushkina Self-employed Dimitra Koutroumpa LATMOS Rosine Lallement Observatoire de Paris Eric Quemerais LATMOS Brian Erland Wood Naval Research Laboratory