Abstract

Several active adaptive optical systems using Na guide stars are currently in operation or under construction.1 Optimization of these system requires a detailed knowledge of the temporal and spatial characteristics of the Na layer on both long term (seasonal) scales and short term scales (daily and hourly). Here we present recent results on the seasonal variations of the Na layer at 40° N and on temporal and spatial variations that occur at low latitudes using data collected at the AMOS observatory at Haleakala, Maui, and onboard an NCAR research aircraft.

© 1996 Optical Society of America