1. Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography University of California, San Diego La Jolla California USA
2. Department of Geophysics Stanford University Stanford California USA
3. Cryospheric Sciences Laboratory NASA Goddard Space Flight Center Greenbelt Maryland USA
4. Department of Aerospace Engineering Sciences University of Colorado Boulder Boulder Colorado USA
5. Earth and Planetary Sciences University of California Santa Cruz Santa Cruz California USA