1. Department of Physics and AstronomyDartmouth College Hanover NH USA
2. Physical Sciences DepartmentEmbry‐Riddle Aeronautical University Daytona Beach FL USA
3. Geophysical InstituteUniversity of Alaska Fairbanks AK USA
4. NASA Goddard Space Flight Center Greenbelt MD USA
5. Earth and Atmospheric SciencesCornell University Ithaca NY USA
6. Department of PhysicsUniversity of New Hampshire Durham NH USA
7. Department of AstronomyUniversity of Maryland College Park MA USA
8. SRI International Menlo Park CA USA