1. The Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
2. Now at Institute for Space–Earth Environmental Research Nagoya University Nagoya Japan
3. New Jersey Institute of Technology Newark New Jersey USA
4. Institute for Space–Earth Environmental Research Nagoya University Nagoya Japan
5. Athabasca University Athabasca Alberta Canada
6. Department of Physics and Astronomy University of Iowa Iowa City Iowa USA
7. Space and Atmospheric Sciences Group Los Alamos National Laboratory Los Alamos New Mexico USA