1. High Altitude Observatory; National Center for Atmospheric Research; Boulder CO USA
2. Department of Earth Sciences; University of Hong Kong; Hong Kong
3. Geophysical Institute; University of Alaska Fairbanks; Fairbanks AK USA
4. Physical Science Department; Embry-Riddle Aeronautical University; Daytona Beach FL USA
5. Department of Physics and Astronomy; Dartmouth College; Hanover NH USA
6. Applied Physics Laboratory; The Johns Hopkins University; Laurel MD USA