1. Swedish Institute of Space Physics Uppsala Sweden
2. Space and Plasma Physics Department of Physics and Astronomy Uppsala University Uppsala Sweden
3. Space and Plasma Physics School of Electrical Engineering KTH Royal Institute of Technology Stockholm Sweden
4. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
5. Southwest Research Institute San Antonio TX USA
6. Department of Physics and Astronomy University of Texas at San Antonio San Antonio TX USA
7. Department of Earth Planetary and Space Sciences University of California Los Angeles Los Angeles CA USA