Figure9 Flow in the QBO-like oscillation (upper-left). Red
line is the convergence of momentum flux, and Black line is the mean flow acceleration
(upper-right). The internal gravity wave visualized by the moíre method
(lower-left). The result of WKB analysis (lower-right). The wave forcing frequency is 0.4s^{-1}(period
T = 15.7 s). Amplitude of piston is 13cm. |