1. School of Physics; University College Dublin; Dublin 4 Ireland
2. Marshall Space Flight Center, National Space Science and Technology Center; Universities Space Research Association; Huntsville AL USA
3. Center for Space Plasma and Aeronomic Research; University of Alabama in Huntsville; AL USA
4. Department of Space Science; University of Alabama in Huntsville; Huntsville USA
5. Earth and Space Sciences; University of Washington; Seattle WA USA
6. Space Science Division; Naval Research Laboratory; Washington DC USA
7. College of Science; George Mason University; Fairfax VA USA
8. Department of Physics and Space Sciences; Florida Institute of Technology; Melbourne FL USA