1. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
2. Department of Physics and Astronomy; University of California; Los Angeles California USA
3. JNL Scientific; Casa Grande Arizona USA
4. Astronomical Institute; ASCR; Prague Czech Republic
5. Department of Space Physics; Institute of Atmospheric Physics; Prague Czech Republic
6. Faculty of Mathematics and Physics; Charles University; Prague Czech Republic
7. Southwest Research Institute; San Antonio Texas USA
8. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
9. Laboratory for Geospace Science; NASA Goddard Space Flight Center; Greenbelt Maryland USA
10. Mullard Space Science Laboratory; University College London; Holmbury St. Mary UK