[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

*Mitsumu K. Ejiri^1,2, Masayuki Katsuragawa³, Ayaka Hashimoto³, Sota Kobayashi³, Sakiko Miyoshi³, Takuji Nakamura^1,2, Takuo T. Tsuda³ (1.National Institute of Polar Research, 2.The Graduate University for Advanced Studies, SOKENDAI, 3.The University of Electro-Communications)

Keywords:The mesosphere and thermosphere, Resonance scattering lidar observation, Calcium atom and ion layers

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.