A new method for measuring the doppler temperature of the atmospheric sodium layer

Details A new method for measuring the doppler temperature of the atmospheric sodium layer A new method for measuring the doppler temperature of the atmospheric sodium layer

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19..681c&link_type=abstract

Advances in Space Research, Volume 19, Issue 4, p. 681-684.

Physics

1

Scientific paper

Over the past few years measurement of the thermal broadening of lidar returns from the atmospheric sodium layer has become a practical technique for monitoring temperature between 80 and 105 km. The method, first demonstrated more than 15 years ago, has now reached the point where it provides the best accuracy, time and height resolution of any technique for the relevant height interval. The principal drawback to the method, as implemented at present, is the high cost of the laser equipment needed to produce the highly stable narrow line-width emission required to measure the hyperfine structure of the sodium resonance. This paper presents a new technique, using a comb laser, which makes it possible to determine the Doppler temperature of the lidar signal with only small modifications to a lidar not originally designed to measure temperature, thus reducing the cost by more than an order of magnitude.

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