Center for Space Plasma and Aeronomic Research, Technology Hall S131 University of Alabama in Huntsville, Huntsville, AL 35758, USA
Southern Polytechnic University, Computer Science Dept., 1100 S. Marietta Pkwy, Marietta, GA 30060, USA
Naval Research Laboratory, Thermospheric and Ionospheric Research and Applications Group, Code 7607, 4555 Overlook Drive S.W., Washington, DC 20375, USA
Space Sciences Lab, University of California, Berkeley, CA 94720, USA
NASA/Marshall Space Flight Ctr, SD50, National Space Science and Technology Ctr., Huntsville, AL 35812, USA
Space Sciences Lab, University of California, Berkeley, CA 94720, USA