1. Department of Physics Auburn University Auburn AL USA
2. Department of Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece
3. Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder CO USA
4. School of Earth and Space Exploration Arizona State University Tempe AZ USA
5. Department of Physics and Astronomy University of Iowa Iowa City IA USA
6. NASA Goddard Space Flight Center Greenbelt MD USA