1. Univ. of Minnesota (United States)
2. Space Sciences Lab., Univ. of California, Berkeley (United States)
3. NASA Goddard Space Flight Ctr. (United States)
4. JAXA Institute of Space and Astronautical Science (Japan)
5. NASA Marshall Space Flight Ctr. (United States)
6. Okinawa Institute of Science and Technology (Japan)
7. Univ. of Texas at Austin (United States)