1. Center for Space PhysicsBoston University Boston MA USA
2. Department of Atmospheric and Oceanic SciencesUniversity of California Los Angeles CA USA
3. Department of Physics and AstronomyUniversity of Iowa Iowa City IA USA
4. Space Sciences DepartmentThe Aerospace Corporation El Segundo CA USA
5. Institute for the Study of Earth, Oceans, and SpaceUniversity of New Hampshire Durham NH USA
6. Space Science and Applications Group, Los Alamos National Laboratory Los Alamos NM USA