Abstract

Since the realization of different narrowband Na fluorescence lidar techniques by Fricke and von Zahn,¹ and She et al.,² research based on active probing of temperatures in the mesopause region continues and several publications with geophysical significance have already appeared in the literature. Regular nighttime observation has been ongoing at Fort Collins, Colorado, since 1991. Analysis of high quality data collected during a two-year period, She et al.³ have reported high resolution seasonally and nightly averaged temperature profiles, from which the thermal structure of a midlatitude mesopause emerges.

© 1994 Optical Society of America