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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 o N, 136.11 o E), and two others were set up at the Muroh Observatory (34.57 o N, 136.01 o E). The range between...