[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

[PEM12-P02] Development of a resonance scattering lidar for simultaneous observation of Ca and Ca⁺ layers

*江尻 省^1,2、桂川 眞幸³、橋本 彩香³、小林 蒼汰³、三好 咲子³、中村 卓司^1,2、津田 卓雄³ (1.国立極地研究所、2.総合研究大学院大学、3.電気通信大学)

キーワード：中間圏・熱圏、共鳴散乱ライダー観測、カルシウム原子・イオン層

To measure temporal variation in vertical density distributions of meteoric metal atom and ion, as a dynamical tracer in the Mesosphere and Thermosphere, and investigate the vertical mass transport, we are developing a resonance scattering lidar for simultaneous observation of Calcium atom (Ca) and ion (Ca⁺). The lidar system has an injection-locked Ti:Sapphire laser with a broad frequency tunability as a transmitter and receives the resonance scatter signals by a telescope with ~80cm diameter. The laser oscillator is designed that can be tuned to the resonance lines of Ca and Ca⁺ ion. We successfully receive the signals from each layer while a development for simultaneous observation is still ongoing. The Ca abundance observed at Tachikawa (36N, 139E) in December was much higher than that in February. This result agrees with a previous study at Kuhlungsborn, Germany (54N, 12E). In this presentation, we will explain the current status of Ca/Ca⁺ lidar system development and show some preliminary results of test observations.