Abstract
The Fabry-Perot spectrometer can be applied to a wide range of problems in upper atmospheric spectroscopy. These vary from line-width measurements at high resolution to low-resolution problems requiring either high sensitivity or rapid time response. A number of such applications are described as have been used for measurements on the aurora, twilightglow, and dayglow from Saskatoon, Canada. Spatial scanning offers a number of advantages that are being currently developed ; some of these also are described

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