1. Space Science Division; Naval Research Laboratory; Washington D. C. USA
2. Laboratoire de Physique Atmosphérique et Planétaire; Université de Liège; Liège Belgium
3. Jet Propulsion Laboratory; California Institute of Technology; Pasadena California USA
4. Computational Physics, Inc.; Springfield Virginia USA
5. Department of Physics and Astronomy; George Mason University; Fairfax Virginia USA
6. Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
7. Department of Physics; University of Central Florida; Orlando Florida USA
8. Research School of Physics and Engineering; Australian National University; Canberra, ACT Australia