1. Department of Physics and AstronomyUniversity of Kansas Lawrence KS USA
2. Center for Space PhysicsBoston University Boston MA USA
3. Space Science and Engineering DivisionSouthwest Research Institute San Antonio TX USA
4. Applied Physics LaboratoryJohns Hopkins University Laurel MD USA
5. Swedish Institute of Space Physics Uppsala Sweden
6. Department of Physics and AstronomyUniversity of Iowa Iowa City IA USA