[1] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA
[2] Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China
[3] Montana State Univ, Dept Phys, Bozeman, MT 59717 USA
[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[5] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[6] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80205 USA
[7] Lockheed Martin Solar & Astrophys Lab, Palo Alto, CA 94304 USA
[8] Marshall Space Flight Ctr, Huntsville, AL 35812 USA
[9] NASA, Goddard Space Flight Ctr, Solar Phys Lab, Greenbelt, MD 20771 USA