Abstract
The middle‐ and upper‐atmosphere (MU) radar (34.85°N, 136.10°E) was operated in the incoherent scatter power‐only mode to observe the ionosphere during 17 June 2001. Pronounced 200‐ to 300‐min. waves in the echo power appeared in the F2 region during 0240–1250 local time on 17 June 2001. A procedure of Fourier analyses is conducted to derive power spectra, vertical phase, and group velocities of the pronounced waves. Results show that the center frequency of the waves is a function of the wave number. The opposite directions of the vertical phase and group velocities imply the presence of atmospheric gravity waves.
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