1. Space Sciences Laboratory; University of California; Berkeley California USA
2. Astronomy and Space Physics Department; Taras Shevchenko National University of Kiev; Kiev Ukraine
3. Institute of Geophysics and Planetary Sciences; University of California; Los Angeles California USA
4. Space Research Institute of the Russian Academy of Sciences; Moscow Russia
5. LPC2E; University of Orléans; Orléans France
6. Los Alamos National Laboratory; Santa Fe New Mexico USA
7. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA