1. LPC2E/CNRS; University of Orleans; Orleans France
2. Space Sciences Laboratory; University of California; Berkeley California USA
3. Astronomy and Space Physics Department; National Taras Shevchenko University of Kiev; Kiev Ukraine
4. Space Research Institute; RAS; Moscow Russia
5. CEA, DAM, DIF; Arpajon France
6. LPP/CNRS; Ecole Polytechnique; Paris France
7. Department of Physics and Astronomy; University of Calgary; Calgary Alberta Canada
8. Institute of Geophysics and Planetary Physics, Department of Earth and Space Sciences; University of California; Los Angeles California USA