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

• Main Authors: Michihiro Uchiumi, Motokazu Hirono, Motowo Fujiwara
• Format: Report
• Language: English
• Published: Department of Physics, Faculty of Science, Kyusyu University 1986
• Subjects: Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1999; http://id.nii.ac.jp/1291/00001999/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1999&item_no=1&attribute_id=18&file_no=1

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.