1. Institute for Space Applications and Remote Sensing; National Observatory of Athens, Penteli; Athens Greece
2. Space Physics Research Laboratory; University of Michigan; Ann Arbor Michigan USA
3. Solar-Terrestrial Environment Laboratory; Nagoya University; Toyokawa Japan
4. USRA at NASA Goddard Space Flight Center; Greenbelt Maryland USA
5. University of Maryland; College Park Maryland USA
6. Instituto de Pesquisas Espaciais; Sao Jose dos Campos; Sao Paulo Brazil
7. Jet Propulsion Laboratory; Pasadena California USA
8. High-Altitude Observatory; NCAR; Boulder Colorado USA