[P-EM11] New frontier: Observations of the middle and upper atmospheres from ISS

[PEM11-04] 超高層大気領域におけるISS-IMAPによる大気光と共鳴散乱光の観測

*齊藤 昭則¹、坂野井 健²、吉川 一朗³、山崎 敦⁴、大塚 雄一⁵、山本 衛¹、秋谷 祐亮¹、穂積 裕太¹、幸野 淑子¹ (1.京都大学、2.東北大学、3.宇宙航空研究開発機構、4.東京大学、5.名古屋大学)

キーワード：電離圏, 熱圏, 中間圏, プラズマ圏, 国際宇宙ステーション, 大気光

ISS-IMAP (Ionosphere, Mesosphere, upper Atmosphere, and Plasmasphere mapping) mission have observed the airglow and the ion resonant scattering in the Earth's upper atmosphere since 2012. The scientific goals of ISS-IMAP are to elucidate following two processes: 1) energy transport process by the structures whose horizontal scale is 50-500km in the Earth's upper atmosphere, 2) the effect of the structures and disturbances on the space-borne engineering system. ISS-IMAP was installed on the Exposure Facility of Japanese Experiment Module, Kibo, of the International Space Station in August 2012. It consists of two sets of imagers, VISI and EUVI. Visible-light and infrared spectrum imager (VISI) observes the Mesosphere and the Ionosphere. Extra ultraviolet imager (EUVI) observes the Ionosphere and the Plasmasphere. VISI observes the airglow in the Nadir direction. The airglow emissions were mainly observed by VISI was 730nm (OH, Alt. 85km), 762nm (O2, Alt. 95km), and 630nm (O, Alt. 250km). Additional airglows, such as Sodium, were also observed. The global distributions of the airglow structures whose scale size is 50-500km in the nightside of the Mesosphere and the Ionosphere have been obtained by the VISI observation. EUVI measures the resonant scattering of 30.4nm [He+] and 83.4nm [O+]. Its field- of-view is 15 degrees, and points the limb of the Earth to observe the vertical distribution of the ions. The observational results including its conjugate observation with the ground-based instruments will be introduced in the presentation.