1. Swedish Institute of Space Physics Uppsala Sweden
2. Center for Space PhysicsBoston University Boston MA USA
3. Department of Physics and AstronomyUniversity of Kansas Lawrence KS USA
4. Department of PhysicsUniversity of Idaho Moscow ID USA
5. Space Science and Engineering DivisionSouthwest Research Institute San Antonio TX USA
6. Department of Physics and AstronomyUniversity of Iowa Iowa City IA USA
7. NASA/Goddard Space Flight Center Greenbelt MD USA