1. School of Earth and Space Exploration Arizona State University Tempe AZ USA
2. School of Mathematical and Statistical Sciences Arizona State University Tempe AZ USA
3. Applied Physics Laboratory Johns Hopkins University Laurel MD USA
4. Department of Aerospace Engineering Sciences University of Colorado Boulder CO USA
5. Haystack Observatory Massachusetts Institute of Technology Westford MA USA
6. Geophysical Institute University of Alaska Fairbanks AK USA