1. Department of Physics and Astronomy; Dartmouth College; Hanover New Hampshire USA
2. Thayer School of Engineering; Dartmouth College; Hanover New Hampshire USA
3. Los Alamos National Lab; Los Alamos New Mexico USA
4. Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
5. Institute for Research and Electronics and Applied Physics; University of Maryland; College Park Maryland USA
6. NASA Goddard Space Flight Center; Greenbelt Maryland USA
7. Space Research Institute; Austrian Academy of Sciences; Graz Austria