1. Space Science and Engineering Division; Southwest Research Institute; San Antonio Texas USA
2. Department of Physics and Astronomy; University of Texas at San Antonio; San Antonio Texas USA
3. Department of Astronomy; Boston University; Boston Massachusetts USA
4. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham New Hampshire USA
5. Department of Nuclear Engineering; University of Tennessee; Knoxville Tennessee USA
6. Space Studies Department; Southwest Research Institute; Boulder Colorado USA