Wind observations with imaging field-widened Michelson interferometers

Several applications of Doppler imaging of airglow using a field-widened Michelson interferometer are being developed at the University of New Brunswick. Simultaneous multi-direction observation of winds has been implemented in an instrument termed the enhanced E-Region Wind Interferometer (ERWIN-2). Another implementation, termed the Michelson Interferometer for Airglow Dynamics Imaging (MIADI) is configured to image the Doppler shifts in a 30° square region of the sky. A third implementation, the Waves Michelson Interferometer (WaMI) is configured to image Doppler shifts in multiple lines in a molecular band. This paper will present results from all three instruments and discuss the advantages of each in terms of observation cadence, wind resolution and phenomena of interest. Accuracies of 2 m/s have been achieved for 45 second measurements for normal airglow volume emission rates.