1. Research and Scientific Support Department of ESA; ESTEC; Noordwijk Netherlands
2. The Blackett Laboratory; Imperial College of Science and Technology; London England
3. Space Science and Engineering; Southwest Research Institute; San Antonio Texas USA
4. Center for Solar-Terrestrial Research; New Jersey Institute of Technology; Newark New Jersey USA
5. Bell Laboratories; Lucent Technologies; Murray Hill New Jersey USA
6. Nuclear and Physics Department; University of Athens; Athens Greece