Ti:Sapphire-laser-based resonance-scattering lidar system for simultaneous observation of Ca and Ca+ layers appearing in the upper atmosphereAyaka Hashimoto, Mitsumu K. Ejiri, Sota Kobayashi, Sayako Miyoshi, Megumi Otose, Chiaki Ohae, Takuji Nakamura and Masayuki KatsuragawaEPJ Web Conf., 362 (2026) 04010DOI: https://doi.org/10.1051/epjconf/202636204010