Long period oscillations in the meteor winds observed over Kyoto during 1978-1983.

We have performed a harmonic analysis on the Kyoto meteor radar (35°N, 136°E) data taken in 1978-1983, and examined long period oscillations at heights of 80-110km. In summer, an intense oscillation with almost constant phase with height has been detected at a period of around two days, although its amplitude varied in time comparable to a few periods of the wave. Other components with periods of several days have also been detected. We have found that the phases of these long period waves progress upward and their vertical wavelengths are fairly long. Their amplitude maxima took place in between midsummer and autumn, and the longer the period is, the later the maximum occurs.