1. Department of Mathematics and StatisticsMemorial University of Newfoundland St. John's Newfoundland and Labrador Canada
2. Department of Space Physics, School of Electronic InformationWuhan University Wuhan China
3. Space Science Applications LaboratoryAerospace Corporation El Segundo California USA
4. Institute for the Study of Earth, Oceans, and SpaceUniversity of New Hampshire Durham New Hampshire USA
5. Los Alamos National Laboratory Los Alamos New Mexico USA