Height Measurements of Nightglow Structures Observed by All-Sky Imagers

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Scientific paper

To determine altitudes of nightglow wave structures, we have carried out simultaneous observations of OH Meinel bands and OI 557.7-nm emissions using four all-sky CCD imagers at two separated site. Two imagers were set up at the Shigaraki MU Observatory (34.85°N, 136.11°E), and two others were set up at the Muroh Observatory (34.57°N, 136.01°E). The range between the two sites is about 32 km. Observations were conducted during the new moon period from 21 January to 3 February 1998 as a part of the Planetary Scale Mesopause Observing System (PSMOS) campaign in Japan. On the night of 24-25 January, 1998, two orthogonal wave structures were observed at both sites. To determine the altitudes of nightglow structures, we use a new technique which is an application of a triangulation method. From the obtained images, we succeeded to derived a distribution of the altitudes differing by as much as 10 km across the field of view apparently in association with a large scale intensity variation

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