Variability in the geomagnetic polar cap neutral wind near the mesopause ab
ove Resolute Bay, Canada (74.9 degrees N, 93.9 degrees W) has been observed
by a Fabry-Perot Interferometer, using a circle-to-line detection techniqu
e (FPI/CLIO) to observe the OH Meinel emission. We present an analysis of t
he first wind measurements obtained with the FPI/CLIO from December 1995 to
March 1996. The OH(7,3) (892.0 nm) Doppler winds were analyzed for tidal o
scillations (defined herein as oscillations with periods which are sub-harm
onics of a solar day). Daily spectral analysis, using 50 relatively clear d
ays showed that oscillations between, and including, 12 h and 8 h were freq
uent throughout the winter season in both the meridional and the zonal wind
s. A non-linear least squares fit, performed on the data from the Jan 22-30
interval, revealed that a 12 h tidal feature was dominant. Observations of
the OH neutral winds show variations indicating strong tidal wave activity
at the mesopause.