The Fabry-Perot spectrometer method of measuring upper atmospheric winds and temperatues has now been firmly established. The Michelson interferometer offers an alternative approach that has so far received little attention. A brief description is given of a stable achromatic field-widened Michelson interferometer, that uses a CCD detector. Four phase-stepped images are reduced to images of phase (leading to velocity) of fringe visibility (leading to temperature), and intensity. Preliminary results of the 557.7 nm emission in aurora, made during field trials in February, 1984 are presented. During an auroral brightening three scale sizes of event were observed in the velocity images: a ''pulsation'' filling the whole field of view and having a period of 200 s, a linear structure with an apparent wavelength of about 50 km, and a linear wavelike structure with an apparent wavelength of 10 km.