In order to investigate the relationships between gravity wave structures of airglow and the quasi-periodic field-aligned irregularities observed by radars, we carried out the ground-based imaging obsevations at three sites in Kagoshima and at Shigaraki during The SEEK (Sporadic-E Experiment over Kyushu) campaign. Simultaneous observations of OH airglow were conducted using two all-sky CCD imagers installed at Uchinoura and Yamagawa, Kagoshima, Japan, respectively. All-sky images of OH airglow displayed a distinct wave structure with a horizontal wavelength of ∿23km at both sites on August 19,1996. The neutral winds in the altitude range of 60-100 km were observed simultaneously by the MF radar at Yamagawa. Applying a triangulation method to these data, we have estimated the height of this small-scale wave structure. The estimated altitude was 89±3km, which was just below the neutral wind enhancements (reaching ∿120m/s) observed in the altitude range of 91-94km by the MF radar.
SEEK キャンペーンにおける OH 大気光発光層の高度決定
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