1. Johns Hopkins University Applied Physics Lab; Laurel Maryland USA
2. Physics Department; University of Calgary; Calgary, Alberta Canada
3. Space Science Branch; Canadian Space Agency; Montreal, Quebec Canada
4. Laboratoire de Physique des Plasmas, CNRS, Ecole Polytechnique; UPMC; St. Maur-des-Fossés France
5. Institute of Space Physics and Applied Technology; Peking University; Beijing China
6. Center for Atmospheric Research; University of Massachusetts Lowell; Lowell Massachusetts USA