1. Space Science LaboratoryUniversity of California Berkley California USA
2. Space Research Institute of Russian Academy of Science Moscow Russia
3. Astronomy and Space Physics DepartmentTaras Shevchenko National University of Kiev Kiev Ukraine
4. Department of Earth, Planetary, and Space Sciences and Institute of Geophysics and Planetary PhysicsUniversity of California Los Angeles California USA
5. LPC2E/CNRSUniversity of Orleans Orleans France