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We study the momentum flux of the atmospheric motions in the height rangesbetween 6 and 22 km observed using the MU radar at Shigaraki in Japan duringa 3 day period in January 1988. The data were divided by double Fouriertransformation into data set of waves with downward- phase- velocity anddata set of waves with upward-phase-velocity for independent momentum fluxcalculation. The result showed that both the 72 h averaged upward fluxand downward flux of zonal momentum were negative at nearly each height,meaning that the upward flux was dominated by westward propagating waveswhile the downward flux was dominated by eastward propagating waves. Themagnitude of the downward flux was approximately a factor of 1.5 larger thanthe upward flux for waves in the 2~7 h and 7~24 h periodbands, and about equal to the upward flux in the 10–30 min and 30 min–2 hperiod bands. It is also observed that the vertical flux of zonal momentumtended to be small in each frequency band at the altitudes below the jetmaximum (10~12 km), and the flux increased toward more negativevalues to reach a negative maximum at some altitude well above the jetmaximum. Daily averaged flux showed tremendous variation: The 1st 24 h (quiet day)was relatively quiet, and the fluxes of the 2nd and3rd 24 h (active days) increased sharply. Moreover, the upwardfluxes of zonal momentum below 17 km in the quiet day for each period band(10~30 min, 30 min~2 h, 2~7 h, and 7~24 h)were dominantly positive, while the corresponding downward fluxes weredominantly negative, meaning that the zonal momentum below 17 km in eachperiod band under study were dominantly eastward (propagating along the meanwind). In the active days, both the upward fluxes and downward fluxes ineach frequency band were dominantly negative throughout the whole altituderange 6.1–18.95 km

Studies of vertical fluxes of horizontal momentum in the lower atmosphere using the MU-radar