1. School of Physics, Astronomy and Computational Sciences; George Mason University; Fairfax Virginia USA
2. Space Science Division; Naval Research Laboratory; Washington D. C. USA
3. School of Chemistry; University of Leeds; Leeds UK
4. Atmospheric and Space Technology Research Associates; Boulder Colorado USA
5. Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
6. Department of Physical Sciences; Dixie State College; St. George Utah USA