Earth Planets Space, Vol. 51 (Nos. 7, 8), pp. 863-875, 1999
H. Takahashi1, P. P. Batista1, R. A. Buriti1, D. Gobbi1, T. Nakamura2, T. Tsuda2, and S. Fukao2
1Instituto Nacional de Pesquisas Espaciais, CP-515, 12201-970 São Josédos Campos, SP, Brazil
2Radio Atmospheric Science Center, Kyoto University, Uji, Kyoto 611, Japan
(Received August 19, 1998; Revised December 30, 1998; Accepted January 17, 1999)
Abstract: Simultaneous observations of the night airglow OH (6,2) band emission intensity and rotational temperature, by a sky scanning airglow spectrophotometer, and meteor winds, by a middle and upper atmosphere radar (MU radar), were carried out at Shigaraki (34.9°N, 136.1°E), Japan, from October 29 to November 11, 1994, as the first phase of a campaign, and from July 25 to July 31, 1995 as the second phase. Horizontal structures in the OH emission intensity and rotational temperature were monitored optically, together with the background wind and its wave induced fluctuations, measured by MU radar. Since the MU radar makes a direct measurement of the vertical wavelength, and the OH spectrophotometer makes a direct measurement of the horizontal wavelength, the two techniques are mutually complementary to determine intrinsic wave parameters. Gravity waves with intrinsic periods of 2 to 9 hours, horizontal wavelengths of 500 to 3000 km and vertical wavelengths of 12 to 75 km were identified. Between the two different observation techniques, there is a reasonable agreement in the inferred wave characteristics.