Observations of the dynamics of the mesopause region over the Norwegian island of And¿ya (69¿N, 16¿E) made during 2 days in summer 1987 using the mobile SOUSY VHF (53.5 MHz) Doppler Radar are reported. Measurements of the three mean wind components and the 12- and 24-hour horizontal tidal components, as well as preliminary estimates of the component of the total upward flux of density-normalized horizontal momentum in the SW-NE plane and the anisotropy of the horizontal wind are presented for the 83- to 90-km height interval. Values of the component of the density-normalized flux in the SW-NE plane for the 10-min to 48-hour period range, after the 12- and 24-hour tidal components have been removed, vary from -1 m2 s-2 near 84 km to 16 m2 s-2 near 89 km. The major contribution is from the 10-min to 12-hour period range. The corresponding mean flow acceleration takes a mean value of -136 m s-1 d-1 over the 83-90 km height interval. The anisotropy is considerable and may suggest the presence of standing waves. ¿ American Geophysical Union 1990