1. Planetary Science Institute; Tucson Arizona USA
2. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
3. Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
4. Space Sciences Laboratory, Physics Department; University of California; Berkeley California USA
5. School of Space Research; Kyung Hee University; Yongin, Geonggi Korea
6. Physics Department; California Institute of Technology; Pasadena California USA
7. Naval Research Laboratory; Washington D. C. USA
8. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington D. C. USA
9. NASA Goddard Space Flight Center; Greenbelt Maryland USA
10. Department of Physics; Catholic University of America; Washington D. C. USA
11. MMT Observatory; University of Arizona; Tucson Arizona USA