HIGH-RESOLUTION FABRY-PEROT OBSERVATIONS OF MESOSPHERIC OH (6-2) EMISSIONS

Over the 1992/93 summer the Fabry-Perot spectrometer at Mawson, Antarc tica (67.6-degrees-S, 62.9-degrees-E), was modified to permit observat ions of two lines in the OH (6-2) band near lambda 840 nm. Preliminary observations were obtained on 5 nights in early February. Analysis of these lines, permitting estimates of mesospheric winds and temperatur es, will be presented. Lambda-doubling of OH (6-2) Q1(2) and P1(3) lin es was measured to be 5.50+/-0.01 pm and 19.17+/-0.06 pm respectively. The results show that mesospheric temperatures can be obtained from Q 1(2) profiles even though the doublet is not fully resolved. This emis sion is significantly more intense than the P1(3) emission so its use will allow better resolution of temporal variations.