ACKNOWLEDGEMENTS

The Weber Na lidar experiment is a cooperative effort of the Colorado State University, Fort Collins, CO, USA, Colorado Research Associates, a division of NorthWest Research Associates, Boulder, CO, USA, the Leibniz-Institute of Atmospheric Physics, Kuhlungsborn, Germany, and the Andoya Rocket Range, Andenes, Norway. This research was supported by the U.S. Air Force Office of Space Research under Contract F49620-00-C-0008 and the National Science Foundation under grant ATM0137555.