1. Department of Physics and Astronomy; University of Texas at San Antonio; San Antonio TX USA
2. Space Science and Engineering Division; Southwest Research Institute; San Antonio TX USA
3. Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder CO USA
4. Blackett Laboratory; Imperial College London; London UK
5. NASA Goddard Space Flight Center; Greenbelt MD USA
6. Applied Physics Laboratory; The Johns Hopkins University; Laurel MD USA