1. Space Sciences LaboratoryUniversity of California Berkeley CA USA
2. Astronomy and Space Physics DepartmentNational Taras Shevchenko University of Kyiv Kyiv Ukraine
3. CEA, DAM, DIF Arpajon France
4. Institute of Geophysics and Planetary PhysicsUniversity of California Los Angeles CA USA
5. Department of Physics and AstronomyUniversity of Iowa Iowa City IA USA