1. Space Science Division; Naval Research Laboratory; Washington, D. C.; USA
2. Plasma Physics Division; Naval Research Laboratory; Washington, D. C.; USA
3. Remote Sensing Division; Naval Research Laboratory; Washington, D. C.; USA
4. Department of Physics and Astronomy; University of New Mexico; Albuquerque; New Mexico; USA
5. Los Alamos National Laboratory; Los Alamos; New Mexico; USA
6. National Radio Astronomy Observatory; Socorro; New Mexico; USA