Mesospheric gravity waves observed with the MU radar located near Kyoto (35¿N, 136¿E) and the Adelaide MF radar (35¿S, 138¿E) are compared for two campaigns in summer and winter. The frequency spectral densities of the horizontal wind motions were larger in summer than in winter at both locations, while the spectral density was almost identical if the summers or winters in both hemispheres are compared. The total variances (u'2 + v'2), of the waves with periods of 2 hours-30 minutes observed in the 70--80 km height range were almost the same at the two sites. This suggests that eddy dissipation processes due to turbulence caused by breaking gravity waves are almost the same magnitude between the hemispheres, which is different from the previous suggestion of the much larger dissipation in the northern hemisphere, derived from the tidal observations at Adelaide and Kyoto. The propagation directions of the different frequency components was also investigated. They seem to be similar at both locations in summer, but the directions were rather widely spread in winter at both locations. The MU radar results showed more preferential zonal directions for the gravity wave propagation compared to the results from Adelaide. These results indicate a difference in the propagation directions between the hemispheres, or the difference at the two locations of Adelaide and Kyoto, which might be caused by differences in topography around the sites. ¿ American Geophysical Union 1993