Aeronomy Laboratory, National Atmospheric and Oceanic Administration, 325 Broadway, Boulder, CO 80305-3328 United States ; Cooperative Institute for Research in Environmental Sciences, University of Colorado at Boulder, 216 UCB, Boulder, CO 80309-0216 United States
Aeronomy Laboratory, National Atmospheric and Oceanic Administration, 325 Broadway, Boulder, CO 80305-3328 United States