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京都大学0048新制・課程博士医学博士甲第1894号医博第485号新制||医||226(附属図書館)5209UT51-52-L65京都大学大学院医学研究科生理系専攻(主査)教授 沼 正作, 教授 早石 修, 教授 佐野 晴洋学位規則第5条第1項該当Kyoto UniversityDA

The seasonal variation of night-time sodium layer at 33゜N

Measurements of the night-time mesospheric sodium layer have been performed since 1977,using a dye lidar at Fukuoka (33.4°N, 130.2°E). The results measured during 1983 are presented in this paper. The annual average in abundance (4.2×(10)^/m^2) is in good agreement with twilight observation made at Kitt Peak (32°N) and lidar measurements at Sao Jose dos Campos (23°S). The annual average of peak height is 93km. Averaging the measurements every three months except for the value on the peak day of the shower, the sodium abundance shows seasonal variation by a factor of 2 with maximum (5.3×(10)^/m^2) in winter and with minimum (2.6×(10)^/m^2) in spring. The abundance increased on the night during the Perseids meteor shower, which is remarkable, since such correlative increment to permanent meteor shower has not been seen at low latitudes by lidar or twilight observations

The seasonal variation of night-time sodium layer at 33゜N (II): Error analysis and results from 1981 to 1984

Measurements of the night-time mesospheric sodium layer have been performed since 1977,using a dye lidar at Fukuoka (33.4°N, 130.2°E). The results obtained since 1981 are presented in this paper. The experimental setup and error analysis are also presented. A simple and sharp maximum in winter such as observed at other lidar stations in the northern hemisphere (51°N, 44°N, and 40°N) could not be found at Fukuoka. However, the monthly averaged abundance shows a variation by a factor of 3 (1981 and 1983). The abundance increased on the night during the Perseids γ meteor shower in 1978,1979,1981 and 1983 when the weather conditions did not preclude the observation of the sodium layer